'usage' now alias for 'help'

diff --git a/executable/Z b/executable/Z
index e9e0c7a..b339534 100755 (executable)
--- a/executable/Z
+++ b/executable/Z
@@ -100,7 +100,7 @@ def CLI(argv=None) -> int:
   # Quick handlers
   if argv[0] == "version":
     print(VERSION); return 0
-  if argv[0] in ("help","-h","--help"):
+  if argv[0] in ("help","usage","-h","--help"):
     print(USAGE); return 0
 
   # Parse options in any order