Blender Git Loki

- removed hack in initrender code that allowed 'border render' in a
previously rendered image. it was just screwing up memory in some cases.
for it to work quite more elaborate coding is needed.
- when selecting border in camera view (SHIFT+B) the associated render
option is set automatic
- fixed some mallocs to become callocs in renderloop, to prevent garbish
when border rendering
- also enables closing bug #179