Pcbnew: fix a serious bug: crashes when attempt to modify a zone that had lost its net (after eeschema changes for instance)

keep all the labelling tools together in the eeschema toolbar.

portrait setting was being overwritten in dialog_page_settings.cpp, add updatePortrait(), improve comments

    sizes.  Tested with postscript output only.  Required minor file format changes
    to reflect the "portrait" setting.  common/dialogs/dialog_page_settings.cpp
    uses a checkbox but its name is "Landscape", which is inverted from portrait,
    but since it is the more common choice, I used that rather than portrait.
    The tooltip for that checkbox makes it clear.  No portrait mode is supported
    for "User" paper size.

* Remove unnecessary copy constructors from board and module library
  objects.
* Add doClone() method to board and library objects.
* Add comment to class definitions where the default copy constructor
  generated by the compiler was adequate.
* Replace copy method with clone method where applicable.
* Remove DuplicateStruct() function.
* Remove track object copy function.

Eeschema: Fix erroneous message [Read Only] after creating a new project, and obviously the corresponding schematic file does not yet exist (replaced by [no file])

Gebview: fix issue in export to pcbnew (Track arc shapes are now exported, approximated by segments)

Pcbnew: fix issue when KICAD_NANOMETER is defined: when zones use htcth to show zones areas, hatch lines were incorrectly calculated (hunded of thousand lines created)
Eeschema: fix issue in search: search not made in reference strings.
Minor fixes, code cleaning and comment enhancements.

* Remove unnecessary copy constructors from schematic and component
  library objects.
* Add comment to class definitions where the default copy constructor
  generated by the compiler was adequate.
* Add assignment operator to EDA_ITEM, SCH_ITEM, and all schematic
  objects where the default assignment operator generated by the
  compiler would not be adequate.

  * Carve out TITLE_BLOCK from BASE_SCREEN
  * Add include/hashtables.h and put class PROPERTIES in there.
    Change PROPERTIES to use "const char*" as the key instead of wxString.
++eeschema
  * Add shim class SCH_BASE_FRAME which introduces the data model SCH_SCREEN
    to the frame EESCHEMA frame class hierarchy and allows sharing of:
    SCH_SCREEN* GetScreen() const;                              // overload EDA_DRAW_FRAME
    void SetPageSettings( const PAGE_INFO& aPageSettings );     // overload EDA_DRAW_FRAME
    const PAGE_INFO& GetPageSettings () const;                  // overload EDA_DRAW_FRAME
    const wxSize GetPageSizeIU() const;                         // overload EDA_DRAW_FRAME
    const wxPoint& GetOriginAxisPosition() const;               // overload EDA_DRAW_FRAME
    void SetOriginAxisPosition( const wxPoint& aPosition );     // overload EDA_DRAW_FRAME
    const TITLE_BLOCK& GetTitleBlock() const;                   // overload EDA_DRAW_FRAME
    void SetTitleBlock( const TITLE_BLOCK& aTitleBlock );       // overload EDA_DRAW_FRAME

    Add shim class SCH_BASE_FRAME which introduces the data model SCH_SCREEN
    to the frame class hierarchy.

rather than being rejected.

This feature is very useful for electronics hobbyists who use DIY PCB technology 
(both toner transfer and photoresist methods).
Also width correction may be useful for PCB designers who take care of track width etching.
This patch also fixes some minor PS plotting issues.

Pcbnew: Now, archive modules function archives footprints with default orientation (0 degrees) and default side (Front layer)

Eeschema: add compil option in sch_field.cpp to go back to old behavior for field texts justifications (this option is not activated)
Note: only vertical texts have a modified behavior.
Minor other changes.

    It describes paper.  The m_Offset field was dropped since it was only used
    in HPGL plotting within EESCHEMA.  PAGE_INFO instance was moved out of
    BASE_SCREEN (which is on its way out) into both SCH_SCREEN and BOARD.


----------- This line and the following will be ignored --------------

modified:
  CMakeLists.txt
  common/CMakeLists.txt
  common/base_screen.cpp
  common/basicframe.cpp
  common/class_plotter.cpp
  common/common.cpp
  common/common_plotHPGL_functions.cpp
  common/common_plotPS_functions.cpp
  common/common_plot_functions.cpp
  common/dialogs/dialog_page_settings.cpp
  common/dialogs/dialog_page_settings.h
  common/dialogs/dialog_page_settings_base.cpp
  common/dialogs/dialog_page_settings_base.fbp
  common/dialogs/dialog_page_settings_base.h
  common/drawframe.cpp
  common/drawpanel.cpp
  common/pcbcommon.cpp
  common/projet_config.cpp
  common/worksheet.cpp
  cvpcb/class_DisplayFootprintsFrame.cpp
  cvpcb/class_footprints_listbox.cpp
  cvpcb/cvframe.cpp
  eeschema/dialogs/dialog_SVG_print.cpp
  eeschema/dialogs/dialog_SVG_print.h
  eeschema/dialogs/dialog_build_BOM.cpp
  eeschema/dialogs/dialog_plot_schematic_DXF.cpp
  eeschema/dialogs/dialog_plot_schematic_HPGL.cpp
  eeschema/dialogs/dialog_plot_schematic_PS.cpp
  eeschema/dialogs/dialog_print_using_printer.cpp
  eeschema/eeschema_config.cpp
  eeschema/files-io.cpp
  eeschema/libedit_plot_component.cpp
  eeschema/libeditframe.cpp
  eeschema/libeditframe.h
  eeschema/load_one_schematic_file.cpp
  eeschema/sch_screen.cpp
  eeschema/sch_sheet.h
  eeschema/schframe.cpp
  eeschema/viewlib_frame.cpp
  eeschema/viewlib_frame.h
  gerbview/dialogs/dialog_show_page_borders.cpp
  gerbview/dialogs/gerbview_dialog_display_options_frame.cpp
  gerbview/events_called_functions.cpp
  gerbview/gerbview.cpp
  gerbview/gerbview.h
  gerbview/gerbview_config.cpp
  gerbview/gerbview_frame.cpp
  gerbview/initpcb.cpp
  include/appl_wxstruct.h
  include/class_base_screen.h
  include/class_colors_design_settings.h
  include/class_pcb_screen.h
  include/class_sch_screen.h
  include/common.h
  include/pcbstruct.h
  include/plot_common.h
  include/wxBasePcbFrame.h
  include/wxEeschemaStruct.h
  include/wxstruct.h
  pcbnew/basepcbframe.cpp
  pcbnew/class_board.h
  pcbnew/class_pad.cpp
  pcbnew/class_pad.h
  pcbnew/class_track.h
  pcbnew/classpcb.cpp
  pcbnew/dialogs/dialog_SVG_print.cpp
  pcbnew/dialogs/dialog_gendrill.h
  pcbnew/dialogs/dialog_pad_properties.cpp
  pcbnew/export_gencad.cpp
  pcbnew/gen_drill_report_files.cpp
  pcbnew/gen_modules_placefile.cpp
  pcbnew/gendrill.cpp
  pcbnew/gendrill.h
  pcbnew/graphpcb.cpp
  pcbnew/initpcb.cpp
  pcbnew/io_mgr.h
  pcbnew/ioascii.cpp
  pcbnew/item_io.cpp
  pcbnew/kicad_plugin.cpp
  pcbnew/loadcmp.cpp
  pcbnew/minimun_spanning_tree.h
  pcbnew/moduleframe.cpp
  pcbnew/onleftclick.cpp
  pcbnew/pcbframe.cpp
  pcbnew/pcbnew_config.cpp
  pcbnew/pcbplot.h
  pcbnew/plotdxf.cpp
  pcbnew/plotgerb.cpp
  pcbnew/plothpgl.cpp
  pcbnew/plotps.cpp
  pcbnew/print_board_functions.cpp
  pcbnew/printout_controler.cpp
  pcbnew/printout_controler.h
  pcbnew/solve.cpp
  pcbnew/xchgmod.cpp
unknown:
  3239.patch
  3268.patch
  build/
  container_test.cpp
  debug/
  dick
  release/
  new/build/
  new/doxygen.sty
  pcbnew/basepcbframe.cpp.orig
  pcbnew/plotps.cpp.orig
pending merges:
  Dick Hollenbeck 2012-01-05 fix unreleased bug pertaining to "Sheet" line in a *.brd file
    Dick Hollenbeck 2012-01-05 [merge] merge in mainline into KICAD_PLUGIN work, which is for the PCBNEW nanometer support
    Dick Hollenbeck 2012-01-05 cannot use plugin until done
    Dick Hollenbeck 2012-01-05 finish up SCH_SHEET::{Set,Get}PageSettings() switch over
    Dick Hollenbeck 2012-01-04 remove page size globals from eeschema
    Dick Hollenbeck 2011-12-30 moving objects into BOARD which are saved in a *.brd file, for PLUGIN access
    Dick Hollenbeck 2011-12-22 [merge] merge in testing
    Dick Hollenbeck 2011-12-22 rename Ki_PageDescr to PAGE_INFO, encapsulate it in accessors, and move it into the BOARD