PURPOSE: Get a CoC_ClientChannel (node index from CoC_PeerList) by a player object.
SYNTAX: playerObject:Object call fNGetNode
RETURNS: Integer index of this player object in CoC_PeerList, -1 on not found
EXAMPLE:
player16 call fNGetNode > 17
invalidPlayer call fNGetNode > -1
HISTORY: CoC bn880 14/11/2003, revised 07/05/2004
DEPENDENCIES: CoC_LIBNUMSYS, CoC_LIBNETWORK