Auto Content is go

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While there were some quirks, I was able to implement the "auto content" magic for posts without much headache. The big quirk is that a given page does not consider its current directory as anything special. The second quirk is that once you enter a wrapper, your context has changed. Fortunately, it does provide both a _PARENT and caller and callers references to the template hierarchy and calling templates, respectively. It's a little bit messier than I would prefer, but it works.

Next up will be the enhanced rss generator that actually includes the blurb.