change EXCHG macro to equivalent inline functions
(better code compatibility with some compilers)

Added: Zones unfill in polygon mode

pcbnew: added oblong thermal relief for oblong pads (from a contribution) . added contributor to kicad list

Only for tests! not for production.

Bug in get online help: kicad.pdf was always called instead of the suitable help file. thanks to the guy who did not test its changes
eeschema: code cleaning
switch to wxWidgets 2.8.9

solved some problems in hotkeys files access when spaces are used in names, and udtated paths according to the new tree used in kicad
Added wxWidgets version in about dialog

add a note to the build versions, to indicate purpose and be grep-able to allow for easier source packaging

useful for creating a config.h via an extraction script that creates a source tar bundle

pcbnew: Excellon files use only ascii codes in comments (some excellon parsers do not like I18n)