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 t
cd t
hg init
echo a > a
hg add a
hg commit -m "test" -d "1000000 0"
hg verify
hg parents
hg status
hg rollback
hg verify
hg parents
hg status