Commit Briefs
log: Implement -s search-pattern
match_logmsg() is copied from tog's match_commit().
if there are no commits to rebase, just forward the rebased branch's reference
Problem found by kn@
Outright forbid reference names with a leading '-'.
Matches behaviour documented in git-repository(5).
show commit date's century in 'got blame' output (patch by Tracey Emery)
tests adjusted by me