filelog: stop proxying rawsize() (API)
This method is no longer used by external consumers. The API is
quite low-level and is effectively len(revision(raw=True)). I don't
see a compelling reason to keep it around.
Let's drop the API and make the file storage interface simpler.
Differential Revision: https://phab.mercurial-scm.org/D4750
To run the tests, do:
cd tests/
python run-tests.py
See https://mercurial-scm.org/wiki/WritingTests for
more information on writing tests.