- move python build section into the python directory (cleaning up)
- fix some broken dependencies
- remove the public_headers targets if doxygen was not found
TODO :
- fix MSVC targets for public headers (wbn if MSVC didn't require the pro version
in order to support solution folders)
- fix osd_regression to not build if -DNO_LIB is present (ie. fix the broken dependency)
be used as intended to specify an installation directory, which can be located anywhere on the
file system.
Also improved the doxygen target and made the doxy build "quiet".
fixes#154