- Added commits-by-year graph/statistics.
- Made 'since' use first reachable commit, instead of GIT epoch (May
2005). To avoid empty bars in the new 'Commits by years' graph.
- Removed start-/end-year filter: on -by-weekday, -hour and -month. Instead
made each `grep` look for its date tag fixed in a more specific sequence
so as to not match commit message.
Was giving problems if a since/until date-span larger than one year was given
(ie. #135, #130, #123).
Maybe should look at removing commit message from log listing entirely.
Not sure why `grep -E "($startYear|$endYear)"` was ever introduced yet.
- Made tests run properly, updated test with usage output.
Added a test-case with LC_TIME=POSIX.