Merge remote-tracking branch 'origin/master' into gsoc2016-improved_extrusion

Curves: Extend and batch extend operators

Renamed "Extend" to "Intersect" and "Batch Extend" to "Extend".

Merge remote-tracking branch 'origin/master' into gsoc2016-improved_extrusion

Merge remote-tracking branch 'origin/master' into gsoc2016-improved_extrusion

Conflicts:
release/datafiles/locale
release/scripts/addons
release/scripts/addons_contrib

Merge remote-tracking branch 'origin/master' into gsoc2016-improved_extrusion

Curves: Chamfer and fillet operators

Fixed some inconsistency on user interaction:

- Chamfer and fillet only enter modal when the selected handle is vector type
- Commented all the tools implemented from the Specials menu. They were not being called on modal.

Update submodules.

Curves: Some tweaks to the work that was concluded during GSoC 2016

If this has not yet been committed:

- Fixed some bugs with the fillet and chamfer operators (filleting and chamfering first and last handles).
- Fixed user interaction with fillet and chamfer.

Curves: Fillet and chamfer operator

Refactored the fillet and chamfer operators. Fixed user interaction for MOUSEMOVE event for fillet operator. Numinput still needs to be checked.

Curves: GSoC 2016 - Bezier curve improvements

Added docstrings to all functions.

Curves: Keymaps

Added keymaps for extend, batch extend, trim, offset, fillet and chamfer tools.

Merge remote-tracking branch 'origin/master' into gsoc2016-improved_extrusion

Curves: fillet and chamfer operator

The modal operators for the fillet and chamfer operators are now 90% complete.
On the chamfer operator, an option is needed to handle angle numinput. It would also be nice to have some sort of circular input for the angle (currently it is linked to the x variation of the cursor position).
For fillet, there is some kind of bug that corrupts curve data.

Due to the above mentioned reasons, modal operators are still commented.

Curves: Chamfer and offset operators

Offset operator: Fixed it to work with vector and free handles.

Chamfer: The operator now preserves all settings from the handles it is modifying (radius, tilt, weight, handle type, etc...).

Curves: Offset operator

Offset now works with auto, align and vector type handles.

Curves: fillet and chamfer

Added support to fillet and chamfer cyclic splines.
Occasionaly, with no apparent reason, the following assertion fails

blender-build/blender/source/blender/blenlib/intern/BLI_ghash.c:458, ghash_insert_ex(), at '(gh->flag & GHASH_FLAG_ALLOW_DUPES) || (BLI_ghash_haskey(gh, key) == 0)

Curves: Fillet and chamfer

Fixed a calculation error in the fillet operator. Limited the chamfer algorithm to just run on the points inbetween the first and the last handles, since it makes no sense to chamfer the start of a line. This brings a problem with cyclic splines though, which will be addressed in a later commit.

Curves: Fillet and chamfer operator

Replaced calls to memcpy with BezTriples with calls to ED_curve_beztcpy, to prevent errors.

Curves: Operator's interface

Added interface options to call all operators. They are available on the tool shelf, under Curve Tools->Modelling, and on the Edit Curve Specials menu.

Curves: Offset operator

Added support for collinear handles and cyclic splines.
Changed the way offset direction is corrected. Previously, the code checked for intersections between the offset spline and the original one. I replaced this with vector calculus.