Update usage patterns

src/jat.sh.skel

     local patts=()
     __jat__show_error "bad usage: $msg"
     case $parent in
-        jat__cmd)      patts=("[assert-options] [-e ES_EXPR] [--] CMD [ARG]..") ;;
+        jat__cmd)      patts=("[assert-options] [-o R_OUT] [-e R_ERR] [-s R_ESF] [-S ES_EXPR] [--] CMD [ARG]..") ;;
+        jat__eval)     patts=("[assert-options] [-s R_ESF] [-S ES_EXPR] [--] CODE") ;;
         jat__cmp)      patts=("[assert-options] RVAL OP OVAL") ;;
         jat__fail)     patts=("[assert-options]") ;;
         jat__pass)     patts=("[assert-options]") ;;