rem: RegisterFilterObj(NsInterp *itPtr, int when, Tcl_Obj *CONST objv[])
add: RegisterFilterObj(NsInterp *itPtr, int when, int objc, Tcl_Obj *CONST objv[])
context: RegisterFilterObj(NsInterp *itPtr, int when, Tcl_Obj *CONST objv[]){    Proc	    *procPtr;    char	    *server, *method, *url;    server = itPtr->servPtr->server;    method = Tcl_GetString(objv[0]);    url = Tcl_GetString(objv[1]);    procPtr = NewProc(Tcl_GetString(objv[2]), Tcl_GetString(objv[3]));    Ns_RegisterFilter(server, method, url, ProcFilter, when, procPtr);    return TCL_OK;}