debian: don't refer to deleted tests/run-tests.py in debian/rules tests/run-tests.py was deleted in 25a0c31882df (tests: remove the custom run-tests.py, 2015-11-02), but we still refer to it in debian/rules. Fix by having the user define a HGSRC variable when calling 'debuild' (with e.g '-e HGSRC=~/hg').

syntax: re
/figures/[^/]+\.png$
^docs/build/
^docs/html/
^html/
\.pyc$
~$
\.swp$
\.orig$
\.rej$
\.err$
^tests/easy_run.sh$
^build/
^MANIFEST$
^docs/tutorials/.*\.rst$
\.ico$