Blender Git Loki

Renamed the edithair files in BKE to editstrands.

The rationale behind this is that the BKE code could be used for
modeling hair and fur as well as a number of other features such as
grass. The primary addition to BMesh is the limitation to strand-like
topology (simple vertex chains, optionally rooted on a mesh surface).

The editor code OTOH is quite hair specific, since the result should
be suitable for hair simulation, and the workflow should mimick actual
hair grooming intuitively. Eventually the hair edit mode could become
a generalized strand edit mode with slightly different tool sets for
various purposes, but for now it is quite specifically built for hair.