merge: pull user messages out to hg.py - add _update for shadowing in clone - add _showstats helper - remove update parameter defaults - move stats message and merge help messages

#!/bin/sh

mkdir a
cd a
hg init
echo foo > b
hg add b
hg ci -m "b" -d "1000000 0"

chmod -w .hg

cd ..

hg clone a b

chmod +w a/.hg # let test clean up

cd b
hg verify