Blender Git Loki

Merged revision(s) 57768-57827 from trunk/blender into soc-2013-dingto

Cycles / Ramp closures:
* Fix crash with negative values in Phong Ramp, and add some checks to survive INF and NAN values.

Patch by Brecht and myself.

Code cleanup / Cycles:
* Some cleanup for castings.

correct previous startup.blend - r57698 (which disabled cycles by accident).
also correct sequencer grid theme color.

Fix #35809: dragging a non-active node in the node editor did not work reliably.
Disabled timer events from the properties editor were cancelling gestures.

Fix #35802: searchbox menu not opening when opened from a popup near the bottom
of the window.

Fix #35890: memory leak in OS X ghost locale detection.

Blender 2.68 Release maintenance:
* Update readme and release-log links to 2.68.

Fix a few DPI/retina scaling issues in the graph editor and movie clip editor.

Patch #35889 by David Jeske.

Merging r57729 through r57815 from trunk into soc-2013-depsgraph_mt

fix [#35884] evil bge.types.BL_Shader.setUniformMatrix3()

Changed Tool Tip for clarity

fix for adding nodes with a DPI besides 72 causing offset.

Added checks to Vertex Groups panel to respect locked Vertex Groups

make screenshot poll for background mode.

fix for crash reading from a freed scene when exiting blender.

fix for recently added active-vertex weight operators crashing on lattice objects in edit mode.

fix for incorrect selection when running MESH_OT_loop_to_region, running wire-frame operator directly after would crash.

use common suffix's for exec/poll functions in recently added vertex-group operators.

fix for zero length normalize before scanfill for meshes and other minor changes.