version 1.14 - major changes

test suite additions for "catch up" code

schema update to v5, for changes to series class.

Added --catch-up argument, which takes the newest episode from each
series and make it the "latest".  No earlier episodes will ever be
downloaded.

During feed processing, we now never make episodes for series we don't
care about.  And, the series slot is set initially, instead of in a
later pass over the episode.