Bug #1388

- #1388 Updated task(1) man pages with import/export script examples (thanks to
  Benjamin Weber).
Bug #1286

- #1286 Cannot use "sow", "som", etc in "entry.after", "end.after" filters
  (thanks to Jake Bell).
Bug #1273

- #1273 Query with negative relative date differs greatly from absolute date
  in past (thanks to John West).