patchbomb: use modern pager to display -n/--test result (BC)
This should provide more consistent UX, but is a BC because the pager will
no longer be fired up for each message.
$ echo "[extensions]" >> $HGRCPATH
$ echo "mq=" >> $HGRCPATH
$ hg init
$ echo 'base' > base
$ hg ci -Ambase
adding base
$ hg qnew -mmqbase mqbase
$ hg qsave
$ hg qrestore 2
restoring status: hg patches saved state