develop branch: integrate subcommands options

[chinyeungli]

All the subcommands options such as --overwrite, --mapping, --extract_license etc. have not been integrated yet.

[chinyeungli]

  --verbosity=VERBOSITY
                        Print more or fewer verbose messages while processing ABOUT files
                        0 - Do not print any warning or error messages, just a total count (default)
                        1 - Print error messages
                        2 - Print error and warning messages

The 0 option will not be integrated as we already have the -q, --quiet option

[chinyeungli]

We need to adapt the new verbosity approach for printing the following:

# modeled after the logging levels
CRITICAL = 50
ERROR = 40
WARNING = 30
INFO = 20
DEBUG = 10
NOTSET = 0

[chinyeungli]

All the option for about.py have been integrated.

[chinyeungli]

  --action=ACTION       Handle different behaviors if ABOUT files already existed
                        0 - Do nothing if ABOUT file existed (default)
                        1 - Overwrites the current ABOUT field value if existed
                        2 - Keep the current field value and only add the "new" field and field value
                        3 - Replace the ABOUT file with the current generation

Do we really need action 2 and 3? @DennisClark I would like to have your input.

[pombredanne]

@chinyeungli: I think you can simplify a lot. IMHO we should not EVEN have these actions options at all.
we should always regen things as new correct data. Anything else is likely to create confusion, and it does confuse me

[DennisClark]

@chinyeungli After a bit of thought, I am inclined to agree with @pombredanne that we should "always regen things as new correct data" and that the options are not necessary.

[chinyeungli]

okay, thanks for the input.