Import Boost Build extensions from my local CVS tree.
Oops, fix copyright.
Create individual example builds for the currently tested build extension libs.
Add example builds for a few more build extension libraries.
Refactor some common rules. Have the OSG example run the text example.
Fix missing ref error to non-local conditional rule.
Add ext build for Luabind (trunk version only).
Add building of Irrlicht 3D engine.
Minor fixes to irrlicht build.
Add 'default' to version features. To allow version-less declares to work.
Undo default value. It was added later on anyway.
Fix disappearing requirements from building boost sublibs.
Fix disappearing requirements from building boost sublibs.
Building of FreeType 2.
Add program_options building to build extensions.
Add missing usage requirement to make the static irrlicht build usable.
Add tests... starting with a test for using an extension within another extension.
Test extension using from outside init rule.
Add compiling of lib3ds library.
Disable non-shared linkage warning when compiling Luabind as a shared lib with msvc.