tests/test-changelog-exec

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
# b51a8138292a introduced a regression where we would mention in the
# changelog executable files added by the second parent of a merge.
# Test that that doesn't happen anymore

"$TESTDIR/hghave" execbit || exit 80

hg init repo
cd repo
echo foo > foo
hg ci -qAm 'add foo' -d '0 0'

echo bar > bar
chmod +x bar
hg ci -qAm 'add bar' -d '0 0'
echo '% manifest of p2:'
hg manifest
echo

hg up -qC 0
echo >> foo
hg ci -m 'change foo' -d '0 0'
echo '% manifest of p1:'
hg manifest

hg merge
hg ci -m 'merge' -d '0 0'

echo '% this should not mention bar:'
hg tip -v

hg debugindex .hg/store/data/bar.i