doctor: better quick option propogation for stats
* use contextmanager for quick stats instead of editing global state
directly
* send quick to lots of stat related functions, so they
could possibly be used without doctor, if someone wanted to
* if a stats function has a 'quick' kwarg, send the value
there as well
* add an option to sort locations in my.time.tz.via_location
- modernize:
- add REQUIRES spec for pdfannots library
- config dataclass/config stub
- stats function
- absolute my.core imports in anticipation of splitting core
- use 'paths' instead of 'roots' (better reflects the semantics), use get_files
backward compatible via config migration
- properly run tests/mypy
