Add --setheader, --setuser, --setdate, --user, --date options to qnew and qrefresh

[Peter Arrenbrecht]

> No. But you can specify defaults -H for qnew and -D for qrefresh in
> .hgrc. And so this means we won't drop -D.

Just to be very clear and possibly save you some documentation
reading: put this into your .hgrc:

[defaults]
qnew = -H
qrefresh = -D