Unbundle mpmath: Fix imports
Unbundle mpmath: install python-mpmath
Unbundle mpmath: drop adapt_path.py script
Unbundle mpmath: drop workarrounds in bin/coverage_*
Unbundle mpmath: drop mpmath from blacklist of runtests.py
Unbundle mpmath: drop mpmath exclude from code quality tests
Unbundle mpmath: don't filter out mpmath directory in setup.py
Unbundle mpmath: document mpmath installation