Tweak 'a' placement in splash

BGE: Fix T45267 Lib load without material caching.

Blender 2.75 release: We're now at 'a' release

Cycles: Add an option to force disable all OpenCL devices

This way it's possible to disable OpenCL devices for AMD devices
which are considered whitelisted.

Fix: Keyframe indicators for NLA Strip properties fails if the AnimData has an active action

Fix T45331, a bevel regression for 2.75.

Got bad results when two beveled edges form straight line
and there are two or more unbeveled edges attached to either
side of the connecting vertex.

Fix T45237: Dither does not work

Fix T45290: Selecting passes in image editor does no longer work

This issue was introduced with the wrong fix I committed for dither (rB56ca7f34)
Which also means T45237 has to be re-open

Correct vert-slide helper-line scale

Was invalid in perspective view

Fix T45281: IOR Value Slider with "Ctrl" modifier does not increment as intended.

Looks like a typo in rB1b8069bd?

Multi-View UI: convergence is only useless for the parallel camera (toe-in still uses it)

Fix vertex slide regression w/ rotated objects

This could only be done with certain rotations.

Fix T45269: Blender 2.75 crashes when I run my the game

Velocity clamping on static objects caused a crash.

Correct --help message

Accidentally marked as 'rc'

Fix T45253: Particle emitter volume mode and grid mode broken in 2.75.x

This is a regression since dced56f and root of the issue comes to the fact
that grid distribution sets UNEXIST flag during distribution, which is then
being reset in initialize_all_particles().

This commit solves the issue, but it's not really nice and some smart guy
might want to revisit it.

Fix T45251 custom directory not taken into account for image proxies.

Note that closest_point_on_mesh is in object space

Fix T45237: Dither dosn't work in Blender Internal Renderer after Multi-View

Fix .obj testing.