Datetime filtering has been separated into the util.hci module.
It now supports relative --from and --to arguments by themselves, as well as
month only and times with milliseconds.
added datetime filtering to CHANGES.md.
fixed bug with --from when parsing from stdin.
added feature to CHANGES.md
changed CHANGES line slightly.
Merge branch 'datetimefilter-refactor' into develop

Conflicts:
	CHANGES.md