cpop clean up old files

[bquandt]

In testing of cpop writing it's files, it does a good job most of the time in not leaving unclosed sync files.

test 1:
while recording, unplug/plug the RS cable.
This causes the audio device to disappear, and reappear.
The sync file is closed (ie it's renamed from 'new' to its final form). This is good.
Now the question becomes, if the recorder is recording, should we go back to recording? Probably. Right now, we don't of course. This is an enhancement/improvement ot our current processing.

test 2:
while recording, unplug the camera (yikes).
Interesting, we end up not closing a sync file, ie we end up with a *.new file in our directory.
These files should be 'closed' so they can be processed on apop. Afterall, they are probably fine up to the point the camera turned off. A side note, interestingly, the Alexa camera ends up breaking the SxS card. While prior recordings are readable, you can no longer write to this card, plus your 'current' recording is lost. BAD behavior on part of the alexa!