tests/test-hup

Add new branch info to templater and use it in map-cmdline.default.

The template currently shows old (hg log -b style) branch tags, too,
but not in the same way as the built in changeset_printer.

#!/bin/sh

hg init
mkfifo p

hg serve --stdio < p &
P=$!
(echo lock; echo addchangegroup; sleep 5) > p &
Q=$!
sleep 3
kill -HUP $P
wait
ls .hg