SYNOPSIS
int valid_query_snoop(object ob)
DESCRIPTION
Should return 1 if previous_object() (the one that called the
efun query_snoop()) is allowed to query wether ob is being
snooped, 0 if not.
The master object is always allowed to use query_snoop().
SEE ALSO
valid_snoop(M), query_snoop(E), snoop(E)