[themes] shortcut for phptemplate variable printouts

[Morbus Iff]

> I forgot to mention another idea (which is still valid
> php but would shorten code):
> 
> <?=$content ?>
> <?=$sidebar_left ?>

I believe this requires PHP's short_tags to
be enabled, which we can't rely on.

-- 
Morbus Iff ( i desire penance for your sins )
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