logical parts, and include files altered to denote internal and external
functions.
include/editmesh.h: internal calls for editmesh_xxx.c files
include/BIF_editmesh.h: external calls for these files
src/editmesh.c: basic alloc/lists and in/out editmode, undo, separate
src/editmesh_lib.c: basic utility calls for all editmesh_xxx.c (no UI)
src/editmesh_add.c: add prim, add duplicate, add vertex/edge/face (UI)
src/editmesh_mods.c: selecting, transforming (UI)
src/editmesh_loop.c: loop tools like knife, loop select, loop subdiv (UI)
src/editmesh_tools.c: other tools (extrude, spin, etc) (UI)
And a new file:
src/meshtools.c: tools for Mesh outside of editmode (normals, draw flags)
