checkheads: add more complexe case where a branch is split on multiple ones
We extend case A-6 and A-7 with partial counterpart. These case are interesting
because some of the partial pushing will (rightfully) works and some other won't.
# utility to setup pythonpath to point into the tested repository
export SRCDIR=`dirname $TESTDIR`
if [ -n "$PYTHONPATH" ]; then
export HGTEST_ORIG_PYTHONPATH=$PYTHONPATH
export PYTHONPATH=$SRCDIR:$PYTHONPATH
else
export PYTHONPATH=$SRCDIR
fi