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.]]