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.
default = "changelog"
header = header-rss.tmpl
changelog = changelog-rss.tmpl
changelogentry = changelogentry-rss.tmpl
filelog = filelog-rss.tmpl
filelogentry = filelogentry-rss.tmpl