Improve flexibility of coverage.py.
Improve flexibility of coverage.py.

Now you can run from anywhere, not just its own directory (easier git
bisecting).

Added --no-coverage command line parameter that turns coverage
information generation off.

traildb/traildb,traildb/traildb,tuulos/traildb,tuulos/traildb,traildb/traildb,tuulos/traildb,tuulos/traildb