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.

Minor change: Eeschema+Pcbnew: display timestamp in edit dialogs (for footprints, sheets, components)

* Make GPCB_PLUGIN::EnumerateFootprints() read the directory contents
  instead of loading the entire cache.
* Make KICAD_PLUGIN::EnumerateFootprints() read the directory contents
  instead of loading the entire cache.

* Make GPCB_PLUGIN::EnumerateFootprints() read the directory contents
  instead of loading the entire cache.
* Make KICAD_PLUGIN::EnumerateFootprints() read the directory contents
  instead of loading the entire cache.

kicad-install.sh and library-repos-install.sh utilize /etc/profile.d/kicad.sh for setting environment variables globally

* Prevent cache from being reloaded on every footprint file read.
* Fix a bug forming wxFileName in GPCB_FP_CACHE::Load().
* Fix invalid file name time stamp debug assertion.
* Use FPID to set loaded footprint name.
* Remove file name <> from exception strings per UIPolicy.