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. 

most editors (besides notepad) will open these files without trouble.

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.

- Display the right docstring for ply files
- Add a filter to *.stl on importing stl files

New: search box.

sort materials so we get predictable output from blender, also add option not to include dates in files.