Enabled ndof devices for controlling colour wheel and cube UI controls
(eg. colour pickers). Tilting the ndof device up and down and rolling it left and
right will move the 'colour cursor' in screen x and y, and twisting the ndof device
will rotate the cursor around the colour wheel (hue). Now you can turn off the
lights and pretend you have a fancy DI deck!

Fix [#27748] undeterministic behaviour of volumetric renderer

* Made clearer in the UI that the approximate multiple scattering always enables light cache
* Fixed a potential problem in anisotropic scattering

Fix [#27378] ASC-CDL Color Balance Node does not allow for full range of values

Report title is incorrect, it does allow for the full range, but actually allows too much, so clamping slope and power min at 0.

Fix [#27438] Volume Material Density Inaccuracy

Lower density limit for shading optimisation was set too high

* Enabled rna access to fluid sim velocity vectors

The main purpose for this is to allow rendering motion blurred blender fluids in external renderers (eg. http://vimeo.com/21870635 ).

Python code snippet for interpreting this data here: http://www.pasteall.org/21577 . Cleaned up some ugly hacks in this area too

* Also added read-only access to scene.subframe to RNA - setting current frame and subframe should still go via scene.frame_set()

Fix [#26896] Displace Node crashes Blender when connected to Z-Buffer

Clamped the maximum displacement distance to 4 x the input image dimensions - prevents hanging when vary large values are mistakenly plugged in, such as Z buffers,

Committing patch [#26960] bu MiikaH, fixes bug:
[#26945] Hue Correct doesn't Hue But Rather Saturate

thanks!

Labelling fix

Fix typo in particle rna

Fix/add OSX style text editing shortcuts to default keymap