obsolete: add a flag that allows fixing "bumped" changeset
The first obsolescence flag is introduced to allows for fixing the "bumped"
changeset situation.
bumpedfix == 1.
Creator of new changesets intended to fix "bumped" situation should not forget
to add this flag to the marker. Otherwise the newly created changeset will be
bumped too. See inlined documentation for details.
To run the tests, do:
cd tests/
python run-tests.py
See http://mercurial.selenic.com/wiki/WritingTests for
more information on writing tests.