mail: use quoted-printable for mime encoding to avoid too long lines (issue3075) Quoted-printable was already used for the more critical patch mails, so it should be fine for everything else as well.

notify: add option for writing to mbox This makes it possible to test how the mails that are sent _really_ look like.

mail: mbox handling as a part of mail handling, refactored from patchbomb

patchbomb: minor refactoring of mbox functionality, preparing for move This allows reuse of the mbox functionality but causes minor changes in the patchbomb console output when writing to a mbox.

tests: run check-code with warnings and maintain a whitelist check-code has fine warning checks, but they are a bit noisy and nobody used them. Now the warnings will be run in the test suite, where a list of accepted warnings will be maintained. Those who introduce or touch a line with a warning will now have to update the whitelist ... or fix the warning.

tests: convert test-check-code-hg.py to .t

test-keyword: use inline doctest syntax

merge with stable

tests: test-largefiles.t should not try to escape from $TESTTMP

largefiles: file storage should be relative to repo, not relative to cwd Revealed by the test in 1fd126cd2d91.