mq: fix qnew and qimport to deal with series file comments qnew and qimport did not take comments into account when deciding where to place new patches in the series file.

#!/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