Increase boost download TIMEOUT to 10 minutes, offer a LOG_DOWNLOAD option for capturing download problems.

* Fix FindwxWidgets.cmake for V3.0 wxWidgets using 'win32' style find. i.e. for MinGW native build without msys or cygwin

[MacOSX] Added support in boost context for PPC processors, now is possible again compile kicad testing for PPC ( https://svn.boost.org/trac/boost/ticket/8266 )

Switch to boost::context for all platforms, almost.
Please try your platform by commenting out fcontext.s in common/CMakeLists.txt.

[MacOSX] fixes issues with previous OSX compilers gcc-4.2 and makes a better general beaviour of KICAD_BUILD_STATIC

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)

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)

build, it throws the time stamps away when there are edits to the CMakeLists.txt portion
pertaining to the external project.  Only a 'make clean' would remove the untarred tree.
This patch removes the need to do a make clean when changing the ExternalProject_Add()
text pertinent to patching.

Fixes bug 1250222 in KiCad-Winbuilder

https://svn.boost.org/trac/boost/ticket/8973
https://svn.boost.org/trac/boost/changeset/84950#file0