Fix income/pull with bundle and -R (issue 820).
Uses ui.setconfig() to tell bundlerepo where the main repo is. This is
needed for when the --repository option is used.
Adds tests to test-bundle and a new test script
test-mq-pull-from-bundle, which plays out the situation that initially
made me detect this bug
(hg -R .hg/patches pull ../bundle.hg).
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<title>#repo|escape#: #file|escape# annotate</title>
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<td class="metatag">changeset #rev#:</td>
<td><a href="?cs=#node|short#">#node|short#</a></td></tr>
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<td class="metatag">author:</td>
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<td class="metatag">date:</td>
<td>#date|date# (#date|age# ago)</td></tr>
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<td class="metatag">permissions:</td>
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