Blender Git Loki

-> New memory allocator for Bmesh

Added a new pooling allocator for Bmesh based upon
the pool allocator availible in the Boost C++ library
as described here:

http://www.boost.org/doc/libs/1_34_0/libs/pool/doc/concepts.html

Each pool allocates elements of a fixed size, so every
element type in a mesh gets its own pool. For instance
verts occupy a different pool than edges. Each pool
is comprised of multiple arrays of a fixed size and allocating
/freeing elements is simple as removing or adding a head
to a linked list. Since the list of free elements is interleaved
throughout the unused space in the arrays, the overhead
for storing the free list is only 1 pointer total per pool.

This makes building/destroying bmesh structures much faster
and saves quite a bit of memory as well.