tests/test-mq-qdiff

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

echo "[extensions]" >> $HGRCPATH
echo "mq=" >> $HGRCPATH

echo % init
hg init a
cd a

echo % commit
echo 'base' > base
hg ci -Ambase -d '1 0'

echo % qnew mqbase
hg qnew -mmqbase mqbase

echo % qrefresh
echo 'patched' > base
hg qrefresh

echo % qdiff
hg qdiff | sed -e "s/\(+++ [a-zA-Z0-9_/.-]*\).*/\1/" \
               -e "s/\(--- [a-zA-Z0-9_/.-]*\).*/\1/"

echo % qdiff dirname
hg qdiff . | sed -e "s/\(+++ [a-zA-Z0-9_/.-]*\).*/\1/" \
                 -e "s/\(--- [a-zA-Z0-9_/.-]*\).*/\1/"