Blender Git Loki

WIP: correspondence update and drawing functions

Merge branch 'master' into soc-2016-multiview

WIP: design RegionSpaceClip (split SpaceClip)

in the progress of seperating view-dependent data fields from SpaceClip
to RegionSpaceClip

fix checking SC_VIEW_CLIP error

- should check sc->view rather than sc->mode
- de-duplicate counting tracking code, by making it get_single_track

fix trivial code format

check witness_clip->mode == SC_VIEW_CLIP

otherwise the multiview mode has problem in 'Motion Tracking' layout,
since dopsheet and graph are also counte when iterating through clips.

Merge branch 'master' into soc-2016-multiview

trying to shift window for secondary clip

Merge branch 'master' into soc-2016-multiview

fix bug in secondary clip open button

after consulting Sergey, I have exposed secondary_clip via RNA and then
fix the corresponding python ui bugs. The operator show now be able to load a
clip to secondary_clip pointer

minor fix for secondary clip open button

know issue: cannot desync primary clip and secondary clip

make a open secondary clip button

Merge branch 'master' into soc-2016-multiview

fix track correspondence loading issue

fix self correspondence error

a track cannot link to itself

move correspondence link code to correspondence mode

Merge branch 'master' into soc-2016-multiview

Merge branch 'master' into soc-2016-multiview

Merge branch 'master' into soc-2016-multiview

add a new mode in space clip view