Blender Git Loki

improve confusing macro GET_ACF_FLAG_PTR
- was operating on `type` which wasnt an argument to the macro.
- was calling return within the macro (makes code harder to follow).

[#30503] Callback for render job completion
from Jason van Gumster (thefallenweeble)

adds render_complete and render_cancel callbacks to bpy.app.handlers

Cycles UI files:
* Minor cleanup and raise blender version to 2.62 in the addon.

fix for debug assignment left in from own commit r44778

also removed private face normal update functions - they were same as public.

OSX/libmv: restrict the unwind.h workaround to 10.6.sdk only

OSX/libmv: added a ahck to fix compiling with 10.6.sdk, unwind.h related

bmesh python api additions:
- BMesh.is_wrapped
- BMesh.copy()
- BMesh.clear()
- BMesh.free()
- BMesh.from_object(obj, apply_modifiers=True)
- BMEdge.calc_length()
- BMLoop.calc_normal()
- BMLoop.calc_tangent()

bmesh py api - correct class references in docs and rename mesh conversion funcs to ne less confusing.

bmesh py api: change .from_mesh() / .to_mesh() to be class methods of BMesh rather than functions in the module.

added example script which converts a mesh to a bmesh, edits and converts back again.

code cleanup: remove unused externs.

style cleanup: + some warning fixes, also remove unused metaelem extern.

Merged changes in the trunk up to revision 44797.

Conflicts resolved:
doc/python_api/sphinx_doc_gen.py
source/blender/makesdna/DNA_mesh_types.h
source/blender/makesrna/intern/rna_action.c
source/blender/makesrna/intern/rna_ID.c
source/blender/makesrna/intern/rna_mesh.c

[#30373] Which part to snap in volume snapping is removed

By Bug reported by Pep Ribal

Also fixed an object mode bug with volume snapping and made it compatible with the edit mode "Snap on self" option

bmesh:
- moved mesh conversion functions into their own file.

bmesh py api:
- can now create a new empty bmesh without first creating mesh data.
- added function to copy bmesh data back to a mesh.
- bmesh.from_mesh() can now get a mesh which isnt in editmode.

2.6 UI:
World Context:
* Made world id block wider
* Don't show texture user when Cycles engine is used
Other:
* Change Dopesheet > DopeSheet in User Preferences Theme section for consistency.

2.6 UI:
* Hide Modifier and Contraint Panel header, this gives a bit space.
As it's the only panel in these context tabs it does not make sense to close them anyways.

patch [#30511] Save/load window state (allows Blender to start maximised)
from Tom Edwards (artfunkel)

This patch fixes bug [#20791]

Remove remained part of debug code.

Forgot to remove code used for debuggning in previous commit.

OSX/cmake: added a comment on method used