Fixes and cleanups to hgeditor:
- "HG: merge resolve" isn't supported for a long time now.
- detection of unchanged commit message if signing is turned off.
- don't add manifest hash to commit message if not signing.
include hg
recursive-include mercurial *.py
include hgweb.cgi
include hgeditor rewrite-log
include tests/README tests/run-tests tests/test-*[a-z] tests/*.out
include *.txt
include templates/map templates/map-*[a-z]
include templates/*.tmpl
include doc/README doc/*.txt Makefile
recursive-include contrib *
include README
include CONTRIBUTORS
include COPYING
include TODO
include MANIFEST.in