tests/test-merge3

localrepo/branchcache: kill unused localrepo.branchcache

The UTF-8 version of the branchcache is the master, always up-to-date, we can
rename it to localrepo._branchcache.

#!/bin/sh

hg init
echo This is file a1 > a
hg add a
hg commit -m "commit #0" -d "1000000 0"
touch b
hg add b
rm b
hg commit -A -m"comment #1" -d "1000000 0"