commit: add ability to print file status after each successful invocation
When commands.commit.post-status is enabled, `hg commit` will effectively run
`hg status -mardu` after committing. It can help catch mistakes like not
committing all needed files or not adding unknown files that should've been
part of the just created commit.
<item>
<title>{branch|escape}</title>
<link>{urlbase}{url|urlescape}rev/{node|short}</link>
<description><![CDATA[{branch|strip|escape|addbreaks}]]></description>
<pubDate>{date|rfc822date}</pubDate>
</item>