document XDG_VTNR

Signed-off-by: Mattias Andrée <maandree@operamail.com>
whoops

Signed-off-by: Mattias Andrée <maandree@operamail.com>
typo

Signed-off-by: Mattias Andrée <maandree@operamail.com>
mds-vt: fix m unmarshal bug + mds-vt: keep track of the number of servers that require non-exclusive mode

Signed-off-by: Mattias Andrée <maandree@operamail.com>