simplify make_filename, fix hg cat bug hg cat was using file-level rev/node ids for generating filename templates. This simplifies make_filename to only use changeset rev/node ids.

#!/bin/sh

unset HGUSER
EMAIL="My Name <myname@example.com>"
export EMAIL

hg init test
cd test
touch asdf
hg add asdf
hg commit -d '1000000 0' -m commit-1
hg tip