This was causing issues because the exceptions file is written using Posix
paths, whereas practracker in Windows was trying to match Windows paths ("\"
instead of "/").
- Introduce 'make check-best-practices'.
- Fix up Tor topdir etc to work with the way 'make check-local' gets called.
- Make practracker less likely to print useless stuff.
No longer messes up with MOCK_IMPL. Also update the tests to show that. We are
still being innacurate on the line count in some cases, but that doesnt matter
so much.
