this helps users to know what kind of option is:
- no value is required(flag option)
- value is required
- value is required, and multiple occurrences are allowed
each kinds are shown as below:
-f --force force push
-e --ssh CMD specify ssh command to use
-b --branch BRANCH [+] a specific branch you would like to push
if one or more 3rd type options are shown, explanation for '[+]' mark
is also shown as footnote.
This command does exactly what 'hg remove -Af [FILES]' does.
The reason for creating a new command is that the options for 'hg remove'
are confusing (-A removes only deleted files, -f forces deletion, and using
both means *the exact opposite of both*).
[mpm: simplified help text, code, and updated tests]
In 'hg', we now show a short list of commands, including extension commands.
In 'hg help', we show core commands, a list of enabled extensions, and topics.
