make addons blender versions consistent

this removes conflicts with the inset built in ctrl/f menu not working if this addon was enabled.

It doesn't completely work yet - there's something funky
about selection, and finishing off the tool, but this
is much better than a non-working inset.

* 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! 

thanks to howardt for this great addition.

[[Split portion of a mixed commit.]]