.pro file: Settings for schematic editor and library list are now stored in 2 independant sections [schematic_editor] and [eeschema].
This fixes Bug #1360219 (Lost settings in eeschema) and keep separation between code relative to lib management and code relative to preferences.
2 or 3 minor settings could be lost in some designs, but they are very easy to reenter.

* Refresh canvas when user cancels edits so that the discarded sheet is
  cleared from the schematic.
* Add file name validation to the sheet properties dialog to prevent
  illegal file name characters from being entered into the text control.
* Rename FOOTPRINT_NAME_VALIDATOR to FILE_NAME_CHAR_VALIDATOR for clarity.

Rework on env. variable KISYS3DMOD. Until now, was used in different files using different ways, so no consistency between files.
Fix also an incorrect default 3d path read from KISYS3DMOD, when the path was defined without trailing directory separator.
code cleanup.

Rework on env. variable KISYS3DMOD. Until now, was used in different files using different ways, so no consistency between files.
code cleanup.

* Use clockwise and counterclockwise in menu strings which is less ambiguous than + and -.
* Moved the rotate hot key R to the rotate clockwise menu entry string.

* Patch Boost interlocked.hpp from version 1.56.
* Fix segfault in Eeschema when auto save event occurs before root sheet is initialized.
* Add assertion when SCH_SHEET_PATH::BuildSheetList is called with NULL pointer.

* Fix C flag parser when there is more than one flag defined after includes when
   wx-config --cflags is called.

All:  Fix an issue due to duplicate ID used in menus and toolbars between a frame and its parents, related to wxUpdateUIEvent events loop.
wxUpdateUIEvent events are be sent to parent frames, when opening a menu in a child frame, if a child frame and its parents share same ID for menuitems (or tools)
The wrong menuitem can be used in some cases ( because there are more than one menuitem with the same identifier), by a wxUpdateUIEvent event function executed in a parent frame.
3D viewer: Add patch from Mario Luzeiro, fix some issues, and clean code.

Add patch from Mario Luzeiro to 3D viewer. Fix a serious issue due to duplicate ID used in menus and toolbars between sub-applications, related to wxUpdateUIEvent events loop.
wxUpdateUIEvent events can be sent to parent frames, when opening a menu in a child frame, if parent and child frame share same ID fro menuitems (or tools)
The wrong menuitem can be used in some cases ( because there are more than one menuitem with the same identifier), by a wxUpdateUIEvent event function run in a parent frame.

Eeschema: Fix some issues (all connections showed as not connected, DRC and NETLIST errors if all sheets in a hierarchy were not open) due to the fact the pointer of a schematic component to its part lib was calculated too late (or never calculated).

Eeschema: fix incorrect value of m_Flags member (must be 0) of schematic components after loading a schematic file.
Previously,  m_Flags was set to IS_CHANGED, which is incorrect.

  *) When kicad.exe closes a project, close any open KIFACEs so that they cannot
     get disassociated from their true PROJECT.
  *) Allow loading eeschema library editor from kicad.exe
  *) Allow loading pcbnew library editor from kicad.exe
  *) Rename LIB_COMPONENT to LIB_PART.
  *) Add class PART_LIBS, and PART_LIB.
  *) Make PART_LIBS non-global, i.e. PROJECT specific.
  *) Implement "data on demand" for PART_LIBS
  *) Implement "data on demand" for schematic SEARCH_STACK.
  *) Use RSTRINGs to retain eeschema editor's notion of last library and part being edited.
  *) Get rid of library search on every SCH_COMPONENT::Draw() call, instead use
     a weak pointer.
  *) Remove all chdir() calls so projects don't need to be CWD.
  *) Romove APPEND support from OpenProjectFiles().
  *) Make OpenProjectFiles() robust, even for creating new projects.
  *) Load EESCHEMA colors in the KIWAY::OnKiwayStart() rather in window open,
     and save them in the .eeschema config file, not in the project file.
  *) Fix bug with wxDir() while accessing protected dirs in kicad.exe
  *) Consolidate template copying into PROJECT class, not in kicad.exe source.
  *) Generally untangle eeschema, making its libraries not global but rather
     held in the PROJECT.

* Remap configuration button on toolbar to launch footprint library table
  editor.
* Remove legacy footprint library path dialog from CVPCB_MAINFRAME.
* Remove unused event ID ID_CVPCB_CREATE_CONFIGWINDOW.
* Minor coding policy fixes.

Pcbnew: add drc test for texts on copper layer (only in full drc test, not in on line drc), from a patch sent by Simon Schumann
Add EDA_TEXT::TransformTextShapeToSegmentList function to export a list of segments used to draw/plot the text.

* Improve footprint text properties layout.
* Use wxStdDialogButtonSizer instead of manually laid out buttons to improve
  platform UI consistency.

Pcbnew, Cvpcb: fix Bug #1355883 . Due to a missing call to a delete operator in CMP_READER class (also creates memory leak).

3d viewer: fix a (minor) bug when run from cvpcb or modedit: the footprint is now centered on Z axis
Better setup for lights, which gives a better rendering

2) LIB_RECTANGLE and related classes sscanf data read from a file using "%s"
without field limits, which can cause problems with malformed/really long
inputs.

3) If some of the optional fields in a lib line are missing, "tmp" can remain
uninitialized.

3D viewer: Parallelized 3D model vertex normal calculations to use all available CPU cores for significant speedup.

Pcbnew: Commit patch (with very minor changes) about SVG file export with the layers ordered from bottom to top. ( bug 1286646 ), from Thiadmer Riemersma.