Docu renamed to Doqu

[Andy]

It is funny indeed, but the project has been renamed once again (after
"models", "pymodels" and "docu"). There are several reasons for this.
First, "docu" was a nice short name but it was next to impossible to
find anything related to the project by this name: you will get all
kinds of documentation for whatever software and hardware you could
imagine but not the Python library. So the name should be more or less
unique. The second reason is that "Docu" did not really address the
central idea of the library: the document/query concept. "Doqu" does
reference the idea: it's an abbreviation for "DOcument-QUery". So here
we are.

Of course I would only rename a project that is not stable yet and
doesn't have a large user base. As Doqu gets more stable (it already
has a rather stable API), there are going to be no major changes — at
least no renames — except for April, 1.

Cheers,
Andy