eeschema: fix compil issue. Boost build: boost lib context built only on OSX (does not build on mingw, and not needed)

(https://svn.boost.org/trac/boost/ticket/8266)

Move HitTestForCorner and HitTestForEdge code from class_zone to polygon/PolyLine.cpp, to avoid redundant code.
Fix bug 1264248.
Fix a very minor issue in RemoveTrailingZeros, for countries where the separator in floating numbers is a comma.

Dialog fp plugin option: Fix compil issue under gcc 4.4 (does not happen with 4.6 and later) about an overloaded function.

Update freedesktop files according to http://standards.freedesktop.org/desktop-entry-spec/desktop-entry-spec-latest.html

add mime type application/x-pcbnew-pcb, extend Desktop Exec to support a file to open on command line

specctra_export.cpp: Fix a conversion error from mils to mm I made i n may last commit, which set min dist to find a segment end for internal outlines holes to 1 mil instead of 10 mils.

dialog fp lib table display not updated (Windows specific) when an option is changed from the lib table option editor
overloaded function in dialog_fp_lib_table.cpp not compiled with gcc 4.4.7 (try to fix Bug #1262002).
specctra_export.cpp: set min dist to find segment ends when building the board outline to 2 microns (should break anything, but should be enough to fix rounding issues when creating/importing board outlines with arcs)

[MacOSX] Treats LLVM as GCC + adds support for boost multiple processor(ppc/intel) and address(32/64 bit)

Pcbnew:, libedit, Save lib as...: the new .pretty lib format is the default, instead of legacy .mod format. The legacy format is still selectable in the file selection dialog.

* Change general properties dialog to allow for entry of arbitrary rotation
  angles for greater than 0 to 90.
* Move global rotation angle variable into PCB_EDIT_FRAME object where it is
  used and add accessors.
* Change rotate footprint undo operation from UR_ROTATE_XXXX to UR_CHANGE.
* Create function to remove trailing zeros from floating point wxString
  objects.