Move buildbot support to sandbox until we decide what to do with it.

[SVN r41362]
removing spirit stuff

[SVN r42024]
Fix missing ref error to non-local conditional rule.

[SVN r42163]
Add ext build for Luabind (trunk version only).

[SVN r42269]
Add building of Irrlicht 3D engine.

[SVN r42312]
Minor fixes to irrlicht build.

[SVN r42313]
Add 'default' to version features. To allow version-less declares to work.

[SVN r42316]
Undo default value. It was added later on anyway.

[SVN r42317]
Fix disappearing requirements from building boost sublibs.

[SVN r42318]
Fix disappearing requirements from building boost sublibs.

[SVN r42319]
Building of FreeType 2.

[SVN r42321]
Add program_options building to build extensions.

[SVN r42324]
Add missing usage requirement to make the static irrlicht build usable.

[SVN r42325]
Add tests... starting with a test for using an extension within another extension.

[SVN r42457]
Test extension using from outside init rule.

[SVN r42458]
Add compiling of lib3ds library.

[SVN r42464]
Disable non-shared linkage warning when compiling Luabind as a shared lib with msvc.

[SVN r42733]
It can be that an extension is initialized outside of a project, for example in a user-config.jam. In that case we need to create a standalone project.

[SVN r42785]
Cleanup outdated win-sdk support extension.

[SVN r42786]
Include src dir for when one needs to compile internal irrlicht extensions.

[SVN r42872]