SetIsRosterMemberSelectable

//RWT-OEI 09/14/05 //Sets the roster member as being selectable or not. Roster members //that are not selectable cannot be changed via the Party Selection //GUI on the client side, but can still be added/removed from a //party via script. Note that if a roster member is set as non-selectable //while they are currently in a party, they will remain in the party //and cannot be removed via the Party Selection GUI. //Returns FALSE if it was unable to locate the roster member int SetIsRosterMemberSelectable( string sRosterName, int bSelectable );