WIP: support of source build of osgBullet, various dependency and build script fixes.
Bullet build now works on Windows
Bullet now builds from source. Still need to fix building of demo executables (or remove them)
All libraries build and link correctly on Windows
working on linux build
build fix
Merge branch 'bullet-febret' of https://github.com/febret/omegalib into bullet-febret

Conflicts:
	external/UseOsgBullet.cmake
cleaned up stuff only need when under development
FIX: linux build
fix conflict
GLUT disabled by default
FIX: merge
FIX: linux build
Merge branch 'bullet-febret' into bullet

Conflicts:
	external/UseOpenSceneGraph.cmake
	external/UseOsgBullet.cmake
	external/UseOsgWorks.cmake
	external/osgbullet.tar.gz
	src/CMakeLists.txt
Merge branch 'bullet' of https://github.com/uic-evl/omegalib into bullet

Conflicts:
	external/UseOpenSceneGraph.cmake