Blender Git Loki

convenience makefile: support spaces in paths

also update for new source/tools paths.

python api internals: no need to set the stop-iter exception string.

vertex weights: add weight quantize tool.

* Some less technical tooltip for the splash screen.

Documentation:
* Update readme for 2.70 (content + links), also updates for new tracker/git.
* Fix some links to the new blender.org website
* Release logs now point directly to the wiki, I don't see a reason to point to the website, just to redirect to the wiki after all.

Freestyle: a follow-up fix of trunk revision 61233. When an iterator has reached
the end, any reference of the object pointed by it will now lead to a RuntimeError
instead of returning None, with the aim of forcing Python API users to check the
end of iteration rather than implicitly indicating the error condition.

Acknowledgement to flokkievids for API discussions in the BlenderArtists.org
Freestyle for Blender thread.

OSX/scons: small reorder and spelling

OSX/scons: fix msgfmt binary linking and locale files distribution

Transform: vertex snapping for curves

This adds vertex snapping capabilities for curves. Snaps to all control points
of other objects, and visible + selected control points and handles in curve
edit mode.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D3

Fix compilation error with SCons when using BUILDINFO and git is not found

Fallback to "no buildinfo" mode in this case.

pose mode: extend selection flipping to use the same method as editmode.

adds extend and active only opton.

armature editmode: option for select mirror to use active bone only.

code cleanup: armature functions

- added BKE_pose_channel_get_mirrored (matching editmode function ED_armature_bone_get_mirrored)
- editbone_name_exists -> ED_armature_bone_find_name

code cleanup: rename flip_side_name to BKE_deform_flip_side_name

Skip .git files from submodules for install targets

Also removed .svn checks when it's not longer needed.
Some further tweaks (probably for OSX bundler) are
likely needed.

Remove check for whether po folder exist

It was just a temp thing to not break stuff
before final git migration.

Fixes for buildinfo of exported source tree

- Better to set branch/hash to "unknown" so
it's clear build is done from exported tree.
- SCons used to reference undefined variable.

armature editing: using too short length checking to add L/R suffix.

Further tweak to .mo compilation on windows

Was wrong dependency used for msgfmt custom command.

Fix T37493: Defocus node with angle = 90° rotates bokeh only for ~1.5°