mq: initializing patchheader class directly from patch content
The patch header needs only be read in order to instantiate the class,
and as such it makes more sense to do it within the class.
#!/bin/sh
echo "[extensions]" >> $HGRCPATH
echo "mq=" >> $HGRCPATH
hg init a
cd a
echo 'base' > base
hg ci -Ambase -d '1 0'
hg qnew -mmqbase mqbase
hg qsave
hg qrestore 2