progress update when encrypting volume

[r3cgm]

When encrypting a volume via tc-play, there is typically no output generated. Since this operation could conceivably take > 24 hours on a 50+ gig file, not having any kind of status update is annoying. Imagine there was a problem that happened 2 hours in and you had no idea... you might wait until 36 hours had passed before grudgingly stopping the process, and you would have wasted a day and a half. Find some way to print progress updates.