Migrate to argparse

[john-]

The optparse module is deprecated. Migrate to argparse. This work is in progress.

Also, when debugging I noticed that the errors on ham2mon startup do not indicate what line generated the exception. I was going to add stack trace to end of the summary messages in the exception handling.

There are currently 3 relatively minor items in this branch:

1. Migration from optparse to argparse
2. Stack trace included as additional exception handling information
3. --debug option that sends additional detail to a debug file

https://github.com/john-/ham2mon/tree/argparse

[lordmorgul]

Reviewed argparse-squashed, looks good.
For note: max demod length, channel spacing, min file size, ctcss filtering, and wide FM are not included at this branch so not args for those.

[john-]

The 'min file size' and 'max demod length' functions exist in this branch but have new names. Also, both are now in seconds:

max demod length = max_recording (seconds)
min file size = min_recording (now in seconds)

[john-]

This is now part of main branch...closing this issue.