Make parsing of /etc/remote work again (some of the options were the

Make parsing of /etc/remote work again (some of the options were the
wrong type), try to make it clearer what comes from where, and add a few
XXX.

Currently there is a mess of default options set in vinit(), default
options set in getremote(), stuff read from /etc/remote and options read
from the command-line, and there remains the problems with leftover
options from rotation. This all needs to be sorted out properly later.

Noticed while trying to find a possible problem reported by miod.