Note: import gimp image also would need it, but it would anyway need a good cleanup (handling of paths is ugly), so did not bothered with it for now.

Systematically adding some custom id to template_list using default UI_UL_list class, this one is commoly used more than once in an area, yielding collision issues if they do not have a custom id...

Addons maintainers please double check the changes.

make addons blender versions consistent

finished

indentation edits and copy pyrimid from contrib (where I had made some edits), removed so this wont happen again.

* You only have to do layout.prop if you want 1 property, no need for row then!
* Use col, row, sub as variable names, not colsub, rowsub, row2 etc please.
* Povray Addon: Still used a lot of splits, you need no split when you only have 1 column! 

- remove unused imports
- remove/comment unused vars
- fix for some bugs with unused vars being used

- renamed: texpaint_ui.py -> texture_paint_layer_manager.py to follow naming conventions
- fixed the tracker url


[[Split portion of a mixed commit.]]