tests/test-issue433

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
# http://mercurial.selenic.com/bts/issue433

hg init a
cd a
echo a > a
hg commit -Ama

hg parents -r 0 doesnotexist
true