tests/test-issue1089

localrepo/branchcache: remove lbranchmap(), convert users to use utf-8 names

We don't need a "local-charset" aware branchmap() function, we can convert the
names when needed during the output.

#!/bin/sh

hg init a
cd a
mkdir a
echo a > a/b
hg ci -Am m
hg rm a
hg ci -m m a

mkdir a b
echo a > a/b
hg ci -Am m
hg rm a
cd b
# relative delete
hg ci -m m ../a