Add history file

I added a history file at $XDG_DATA_HOME/bollux/history.
Its format is of the form
<date %FT%T>	<URL>	<TITLE>
the date is generated with the printf trick.  I should probably be doing
version checking or at least say we require bash 4+.

The code to get the title of the page is pretty gross.  Basically I have
to run the content of the pipeline through like, two times? A read loop.
Check out ll. 333-348 to see how weird it is.

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