* better type safety for BM_elem_flag_* and BM_elem_index_* functions.
* add BMElem type to be used where BMFace/Edge/Vert/Loop can be interchanged.
* fix bug in select manifold, found when making functions more strict.
* BMFace.copy_from_face_interp(face)
* BMLoop.copy_from_face_interp(face, vert=True, multires=True)
These are important for rebuilding geometry from existing faces without loosing UV's, vcols etc.
* remove 'select' and 'hide' from BMLoop
* remove BMesh.update
* add BMesh.normal_update(skip_hidden=False)
* add BMElemSet.index_update(), eg: bm.verts.index_update()
bmesh api
* BM_mesh_normals_update() now takes skip_hidden as an argument
(previously this was default behavior), however this isnt good when
using BMesh modifiers, where you want all normals to be recalculated.
* add bm_iter_itype_htype_map[], to get the iter type from a BMesh
iterator.
bmesh.utils.face_join(faces)
added a utility function for converting a list of python BMesh elements into a C array.
use for this face_join as well as BMesh.faces.new()
* bmesh.types, just allows access to BMVert, BMEdge etc.
* bmesh.utils, so far only added edge_split() function, this module will give access to mesh editing functions.
* Only have 1 python object per bmesh, vertex, edge, loop, face.
* Store pointers back to the python data in a custom data layer so as not to use more memory for normal editing operations (when pythons not running).
* Currently this data is created and freed along with the BMesh PyObject.
* Incidentally - this fixes comparisons for bmesh elements which wasnt working before.
corrently allows to create and loop over verts/edges/faces, access selection and selection modes.
this is still WIP, access to face, edge verts is still missing, no access to UV's, no access to editing operations yet.
When the api is ready it will be documented by sphinx like mathutils, blf, aud.
