make mq and tags hardlink safe
The code didn't check for modes like "r+" or "rb+".
Many thanks to agriffis for noticing it.
#!/bin/sh
"$TESTDIR/hghave" symlink || exit 80
hg init a
cd a
echo '% directory moved and symlinked'
mkdir foo
touch foo/a
hg ci -Ama
mv foo bar
ln -s bar foo
echo '% now addremove should remove old files'
hg addremove