Design rules: increase number of vias and tracks sizes
Pcbnew: netlist reader: change from my recent commits to keep netnames in pads for footprints not in netlist
(allow an user to place some footprints by hand, set pads netnames and do not lost these netnames when loading a netlsit)
Fix other very minor issues.

Code cleaning and other minor fixes.

the match between wxString::Format() or wxString::Printf() format strings
with passed arguments, but does this at runtime, not compile time.
Fix some mismatches.  size_t is a 64 bit type on x86_64 whereas int and
unsigned are 32 bit types.  On 32 bit machines they are all 32 bits so
this error is probably not triggered.

Pcbnew: Added: modview. This footprint viewer frame which has the same purpose as Viewlib in Eeschema.
this viewer is built using the new  FOOTPRINT_VIEWER_FRAME class.

Pcbnew:  First draft to use a new netlist format ( containing the same info as the intermediate netlist, but using S expressions)
* Eeschema can generate this netlist format.
*   Pcbnew can use (automatic identification) the current format or the new format.
*   Cvpcb does not use yet the new format.

compile base_screen.cpp separately for {pcbnew,cvpcb} and eeschema, so we can diverge internal units at compile time, not runtime

Pcbnew: 2 minor enhancements

keep all the labelling tools together in the eeschema toolbar.

    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.

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])

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.

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

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.

* Move SCH_ITEM::Place() code into SCH_EDIT_FRAME so schematic item
  objects no longer have any knowledge of the schematic frame window
  or undo/redo containers.

Fix bug 910364: When a footprint saved in a .mod file is not on front layer and/or not with orientation 0 degree, the Module editor load it incorrectly.
note:  the Module editor save it with default orientation and layer, but the archive function does not, so some footprints can be not editable.
TODO: modify the Archive Function to use the default layer / orientation.

Pcbnew: fix a very minor issue.

* EDA_DRAW_PANEL completely encapsulated.
* Moved OSX m_overlay member from EDA_DRAW_PANEL to EDA_DRAW_FRAME where
  it is used.
* Doxygen comment warning fixes.

Eeschema: fix a minor issue.

Duplicate segments where created in drag command and netlist calculations.

* EDA_DRAW_FRAME completely encapsulated.
* Encapsulate the the low hanging fruit in EDA_DRAW_PANEL.

Better code in test connections in zones.
Very minor other fixes

* Add check box and flag to ignore replacing the component reference
  designator field.
* Fix a resizing bug when switching between the find and replace modes of
  the find/replace dialog.
* Fix replace component reference designator field bug.
* Force rebuild of search list when schematic is modified and the replace
  dialog is closed.
* Prevent finding the next item when the find/replace dialog is closed.
* Respect warp mouse pointer setting when closing find/replace dialog.
* Fix duplicate mnemonic control accelerator keys in find/replace dialog.

* EDA_RECT and EDA_ITEM completely encapsulated.
* Removed unnecessary EDA_ITEM member m_Selected and replaced functionality
  with SELECTED flag bit.

Minor cosmetic enhancements.
Pcbnew: more workd abput connection algorithms (work in progress)