Merge branch 'lt/approxidate'

Merge branch 'lt/approxidate'

* lt/approxidate:
  fix approxidate parsing of relative months and years
  tests: add date printing and parsing tests
  refactor test-date interface
  Add date formatting and parsing functions relative to a given time
  Further 'approxidate' improvements
  Improve on 'approxidate'

Conflicts:
	date.c