Blender Git Loki

And here's a decent fix for correctly recognizing the the
.blend1 etc backups.
Proves again that lazy coders only make bad code :)

Implementation note:
The filewindow now recoginizes .blend version backups as
a special type, so filtering for .blend files themselves
ignores it. However, they're recognized correctly as valid
.blend files, and draw an icon as .blend file when filtering
is off. Can become a distinct icon if we want...