tests/test-cat

new extension: fetch -> combine pull and merge/update

pull changes from remote repo.
if changes add new head: merge with new head, commit result.
else: update working dir to new head.

this makes useful command like git 'pull' command.

#!/bin/sh
#
mkdir t
cd t
hg init
echo 0 > a
echo 0 > b
hg ci -A -m m -d "1000000 0"
hg rm a
hg cat a
sleep 1 # make sure mtime is changed
echo 1 > b
hg ci -m m -d "1000000 0"
echo 2 > b
hg cat -r 0 a
hg cat -r 0 b
hg cat -r 1 a
hg cat -r 1 b