[Petal] PATCH: omit omit-tag from templates

[Jonathan Vanasco]

This is a trivial patch...

I noticed while checking some petal cache documents that if omit- 
tag="string:1" were set - which is the recommended way of always  
omitting a tag from a document -  it was turned into code that always  
returned true

that seemed a bit wasteful.  this patch just does a secondary check  
on omit-tag items , to see if it is set to string:1

if it is, the start/end tags aren't pushed onto the result stack.  if  
its not , they are.

this seems to work fine, and respect nested items

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