bash_completion: completion for commands provided by extensions
Make the bash_completion function call _hg_cmd_$cmd to generate
completion candidates for $cmd if that function exists.
Add basic completion functions for:
- mq:
- qpop
- qpush
- qdelete
- qsave
- qcommit
- strip
- hbisect:
- bisect
- patchbomb:
- email
- gpg:
- sign
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