bash_completion: small cleanup and bugfix
_hg_count_non_option wasn't taking global options into account
while counting non-option arguments.
It also used only its first argument.
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<a href="?cmd=changeset;node=#node#;style=raw">raw</a>
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<h2>changeset: #desc|escape|firstline#</h2>
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<th class="description">description:</th>
<td class="description">#desc|escape|addbreaks#</td>
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