tests/test-alias

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

cat >> $HGRCPATH <<EOF
[extensions]
alias=

[alias]
myinit = init
cleanstatus = status -c
unknown = bargle
ambiguous = s
recursive = recursive
EOF

echo '% basic'
hg myinit alias

echo '% unknown'
hg unknown

echo '% ambiguous'
hg ambiguous

echo '% recursive'
hg recursive

cd alias
echo foo > foo
hg ci -Amfoo

echo '% with opts'
hg cleanst