bash_completion: small updates and fixes
- $result in _hg_commands is not an array
- use "hg status ."
- update "hg cat" completion
- let bash itself generate the default completion
checking changesets
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1 files, 1 changesets, 1 total revisions
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
verify failed
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
1 files, 1 changesets, 1 total revisions
commit failed