Don't log *.part files in Downloads folder

Hello:

I really like Downloads folder being monitored, really handy! The problem is that FF
creates a *.part file until the download is finished, so in the end you get two files in the DB, yet
the *.part one has ceased to exist and is redundant.

I'll humbly recommend:

a) Just keep the $filename*.part file in DB until $filename appears/is complete, which I guess
can be a PITA since you'll have to do checks and DB deletions.

b) Don't log *.part files at all. Since most cannot be opened anyway, being incomplete files,
I don't think not-logging *.part files will be a loss.