Implementation of per-user .hgignore.
Reference: http://www.selenic.com/mercurial/bts/issue166
If the [ui] section of .hgrc contains keys like "ignore" or
"ignore.something", the values corresponding to these keys are
treated as per-user hgignore files. These hgignore files apply to all
repositories used by that user.
#header#
<title>#repo|escape#: tags </title>
<description>#repo|escape# tag history</description>
#entriesnotip%tagentry#
</channel>
</rss>