tests/test-requires

mq: some improvements to header rewriting (closes #690)

Tested with qrefresh -m against the mm series.

#!/bin/sh

mkdir t
cd t
hg init
echo a > a
hg add a
hg commit -m test -d "1000000 0"
rm .hg/requires
hg tip
echo indoor-pool > .hg/requires
hg tip

true