make manifest friendlier switch to using context code ..which uses first parent by default show file hashes only with debug switch show permissions with verbose fix up tests

#!/bin/sh

hg init
touch a
hg add a
hg ci -m "a" -d "1000000 0"

echo 123 > b
hg add b
hg diff --nodates

hg diff --nodates -r tip

echo foo > a
hg diff --nodates