tests/test-rebuildstate

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).

#!/bin/sh
# basic test for hg debugrebuildstate

hg init repo
cd repo

touch foo bar
hg ci -Am 'add foo bar'

touch baz
hg add baz
hg rm bar

echo '% state dump'
hg debugstate | cut -b 1-16,35- | sort
echo '% status'
hg st -A

hg debugrebuildstate
echo '% state dump'
hg debugstate | cut -b 1-16,35- | sort
echo '% status'
hg st -A