conflictHandler 'resolve' error

[hpaulj]

For the new 'resolve' case in base.js, parser.formatHelp() produces

usage: _mocha [-h] [--foo FOO] [--foo FOO]
Optional arguments:
  --foo FOO  new foo

That is, [-foo FOO] appears twice in usage, and the usual -h, --help Show ... line is missing.

The help message should be

usage: _mocha [-h] [--foo FOO]
Optional arguments:
  -h, --help  Show this help message and exit.
  --foo FOO  new foo

[hpaulj]

My https://github.com/hpaulj/argparse/tree/conflictHandler branch is closer to the python code in structure and behavior. It should be read to pull soon.

[puzrin]

No problems.Will be waiting for your pull request. Thanks a lot for your efforts.