Blender Git Loki

The code from the orange branch has now been copied into HEAD.

Here are some notes written by Ton:

There's several areas I still have to work on, so don't immediately
report bugs!

- Preview renders in buttons window only supports materials now (no
lamp, texture or world)
- Yafray code has to be checked, it might not work
- unified render doesn't work, might not come back even
- lens flares dont work yet
- motion blur and field render doesnt work yet
- exr libraries are static linked still, we look at making it dynamic
loadable
- the compositor is fully in development still

I really advise people to check on the orange cvs logs too (in case you
ignored it), this has most of the information in it.

At this moment I still have to code for Orange deadlines, that defines
my priority listing mostly. And since we don't use Windows there, doing
testing and bugfixing for that platform would be of great help!

Best features of this commit to checkout:

- Grouping
- full fixed library linking system
- custom bone drawing
- bone layers
- Material/Shading nodes
- recode of render engine
- preview renders
- Compositing options

When the work pressure is a bit lower, I'll make nice docs for all of
this!

-Ton-