A new mtime cache plugin

Just wanted to let people know about a new Pyblosxom plugin:

https://github.com/seanh/pyblosxommtimecache

It does the same thing as the entrycache plugin (that is: it saves the
dates of your entries so that they don't change if you edit a file),
but I wanted a version that would keep the entry dates in a YAML file
(really nice and easy syntax for editing by hand) and that would have
really simple source code and installation instructions.

This one was harder than I expected to write, the fact that Pyblosxom
requires mtimes in os.stat format is pain.

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