Improved Python logging

[tparchambault]

Several improvements to Python logging.

• Dual logging to stdout and disk
• Add log verbosity flag to cli to toggle between warn/info/debug levels
• Log points added to debug redux dispatch events

No v flag specified is warn, -v is info, -vv is debug.

Closes #668

[tparchambault]

The default log location is ~/.local/share/fapolicy-analyzer/fapolicy-analyzer.log. Use the -h option to see the supported loglevels.

The verbose output to stderr is now INFO where previously it was DEBUG and is not configurable.

Only a small subset of the existing logging.debug() statements were converted to logging.info()

[tparchambault]

I've got to move my logging.warn()s to logging.warning()s. The former is deprecated.