zero length bones had their tail offset in the wrong direction.

API: 34650
fix: x-offset in one mapping of Alphamap was inverted

Fixed: blob finish wrong level raised POV parse error.(the AllObjects.blend test scene now renders (though not all objects supported yet))
Added: support for deactivating all shadows from scene shading panel (per lamp 'no shadow' still works)

Some minor pep8 fixes.

Cleaned up Media and photons UI layouts

The output to Tempfiles no longer exports comments, indentations or LFs (in lists).
New option in Export settings to deactivate LF (line brakes) in lists.
Fixed a material export for normal maps. Was exported two times.
Paths to images are now realpaths, no /../ in absolut paths.

Usage: Deactivate "OS Tempfile" to see the new options.
Some UI and code cleanup. 

Fixed Campbell's noticed strange code: a useless or statement
and made clearer clamping for Front and back diffuse.

noticed some strange code, added XXX FIXME.

- metaballs with no supported elements would give an error. no they are skipped.

Lower Delay will rise errors when rendering big images. 
My system Win7 64 (slow HD) reports following error on lower Delay: 
---
Reached EOF while decoding PNG
Cannot open input file
Cannot create backend data
Unknown fileformat
---

Maybe Delay should be bound to the imagesize. Or is there a better solution to wait for povray to finish the writing?