Don't clear the bitfield for blocks it's possible we have, even though

the resume file and content aren't synchronized. Save the resumefile
every 15 seconds for torrents we're downloading. This way we don't have
to redownload much content because of crash or whatnot. Not that btpd would
crash :)
Also, as there were probably no point in fsync'ing the content when we closed
the write stream, that is not done anymore.

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