[Petal] Auto omit-tag

[Josh Narins]

I tend to use the same tag, over and over, to identify to me that I am
going to omit the tag (petal:omit-tag="string:1"). I generally use
tables and not divs, so if I see <div>, I know there is an omit-tag at
the end.

Any chance there could be a feature that automatically omitted a
specified tag? <omit petal:condition="">, for example.

I use them for control structures, like repeats and conditions.

Not a huge deal, but it might be nice.

-Josh