Fix compatibility issues with old xpm icons.
Add or update .xpm and .ico files for shortcuts and taskbars
Remove artwork folder.

Fix minor other issues.
Remove unused files.

* Added checks for Inkscape and pngcrush when MAINTAIN_PNG mode is enabled.
* Rebuild PNGs with transparent background.

Remove minizip from kicad sources. Useless because now (and since a long time) wxWidgets supports full zip file read/write, and minizip build creates problems under Windows, due to zlib not always installed.

* Rename all ADD_MENUITEM_* functions to AddMenuItem and move them to
  wxstruct.h since they are used by the Kicad main frame classes.
* Move SET_BITMAP and SETBITMAPS definitions to wxstruct.h.
* Fix a bug in SET_BITMAPS that prevented enabling menu item images on
  OSX.
* Rename MsgItem to EDA_MSG_ITEM.
* Remove redundant includes from modified files.
* Doxygen and coding style policy fixes.

* Check user write permissions before saving project file.
* Append read only to file name and path in title bar when the user
  does not have write privileges.
* Remove displaying file dialog every time the project file is saved.
* Doxygen comment and coding style policy fixes.

Minor fixes and enhancements.

Eeschema: optimize import of footprints names ( .stf files) that was time consumming with large designs.

* Remove most (not all) variables that were initialized but never used that
  cause GCC 4.6 to generate a warning.
* Fix bug in schematic library editor best zoom calculation.

fix an issue created by commit 2954. Gerbview: display now an indicator of layers in use. minor code cleanup.

Kicad: bug fix: in zip project command: filenames are now quoted in command string. Previously if files have space or other exotic character in name, zip fails.

* Move schematic wire and bus break code into schematic screen object.
* Move schematic test for dangling ends into schematic screen object.
* Remove left over debugging output in schematic screen object.
* Remove unused file eeschema/cleanup.cpp.
* Fix bug in schematic line object hit test algorithm.
* Fix a string concatenation compile error added in r2752.
* Rename class WinEDA_BasicFrame to EDA_BASE_FRAME.
* Rename class WinEDA_DrawFrame to EDA_DRAW_FRAME.
* Rename class WinEDA_DrawPanel to EDA_DRAW_PANEL.

Minor cosmetic enhancements.
commint forgoten files in boost lib.

fixed bug 641982 (I hope)

removed in drawpanel an erroneous change (was made only for a test). drc code cleaning. cmakelist.txt changes in minizip.