Start reproducing the problems reported in the bug.
* bzrlib/tests/test_log.py: (LogCatcher): Avoid all known filtering by default. (LogCatcher.__init__): Respect the signature or we lose part of the command-line parameters (--levels at least).
* bzrlib/tests/blackbox/test_log.py: (TestBug474807): Reproduce graph and problems reported in bug.
* bzrlib/log.py: (calculate_view_revisions): Really deprecate ! We lost one year here :-/ (_rebase_merge_depth): Deprecate too since it's only used by a deprecated function.