Fix T41381: Moving shapes keys up/down, after last, they don't go to first (as Vertex Group).

Was more a feature request actually, but anyway...

Note this is a bit more complex than it's vgroups counterpart, since we have to handle
relations between keys (relative keys, and position for absolute ones).
Fix T41295: Rigid bodyfield weights not working.??

Looks like `rna_EffectorWeight_update()` was not really working, now uses same kind of code
as `rna_Physics_update()` from rna_scene.c.
Minor tweak to own previous shapekey_move commit.
Fix for rB3cd2c6145ae1.

ID using EffectorWeight is not always a scene...
Fix T41385

Pretty old bug, reset flag to not use color transform by default.
Fix T41379: Drag n Drop .txt files text editor fails

by kevindietrich
Utility functions for getting boundbox size/scale
View3D: rotate around selection - uses boundbox center
Comments
Run unittest.main() directly
Fix T40766: Startup fails with UnicodeDecodeError on Windows
Fix T41395: Set Object As Camera - Monkey Render bug?
Pie Menus C code backend.

This commit merges the code in the pie-menu branch.

As per decisions taken the last few days, there are no pie menus
included and there will be an official add-on including overrides of
some keys with pie menus. However, people will now be able to use the
new code in python.

Full Documentation is in http://wiki.blender.org/index.php/Dev:Ref/

Thanks:
Campbell Barton, Dalai Felinto and Ton Roosendaal for the code review
and design comments

Jonathan Williamson, Pawel Lyczkowski, Pablo Vazquez among others for
suggestions during the development.

Special Thanks to Sean Olson, for his support, suggestions, testing and
merciless bugging so that I would finish the pie menu code. Without him
we wouldn't be here. Also to the rest of the developers of the original
python add-on, Patrick Moore and Dan Eicher and finally to Matt Ebb, who
did the research and first implementation and whose code I used to get
started.
Minor cleanup
Manifest used to be installed on non-windows platforms
Fix T40744: MIP Map is generating strange noise in texture, Blender Internal
Fix T40203: Fluid simulation needs more memory than displayed.

Nothing like a fix, actually, this is an issue in elbeem afaik.
For now, just warn user that complex obstacles may breack things.
Fix T40047: Smoke: Maximum value for initial velocity.

Based on D644, by robschia (Roberto Schiavone).
Fix for previous commit - after talk with physics guys (Genscher, Miikah), better
to keep soft UI limits as is, and only raise hard ones.
Fix T41360: Crash on Boolean Modifier

The issue was caused by the wrong attributes maps in certain
circumstances after union intersections.

Namely issue might have happen when more than one iteration of
union was happening and it was caused by the fact that new faces
might be allocated on the same address as freed face from the
old mesh.

Didn't find a nicer fix for this apart from correcting the whole
attributes map after each union step.

We could try removing attributes for the meshes which are getting
deleted, but in asymptotic it's gonna to give exactly the same
complexity as the current approach.