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.
#!/bin/sh
hg init
echo "[hooks]" > .hg/hgrc
echo 'precommit = echo precommit hook' >> .hg/hgrc
echo 'commit = echo commit hook: $NODE' >> .hg/hgrc
echo a > a
hg add a
hg commit -m "test" -d "0 0"