journal: use the dirstate parentchange callbacks
Instead of hacking into dirstate internals let's use the callbacks
to be notified about wd parent change.
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<p class="p1"><b>Before you install</b></p>
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<p class="p3">This is an OS X version of Mercurial that depends on the default Python installation.</p>
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<p class="p1"><b>After you install</b></p>
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<p class="p3">This package installs the <span class="s2">hg</span> executable as <span class="s2">/usr/local/bin/hg</span>. See <span class="s2">hg debuginstall</span> for more info on file locations.</p>
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<p class="p3">Visit the <a href="https://mercurial-scm.org/">Mercurial web site and wiki</a></p>
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<p class="p3">There's also a free book, <a href="http://hgbook.red-bean.com/">Distributed revision control with Mercurial</a></p>
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<p class="p3">If you run into any problems, please file a bug online:</p>
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