Try to guess first/last name when making new rattail user via command line

rattail/commands/core.py

@@ -1147,7 +1147,11 @@ class MakeUser(Subcommand):
         if args.admin:
             user.roles.append(auth.administrator_role(session))
         if args.full_name:
-            user.person = model.Person(display_name=args.full_name)
+            kwargs = {'display_name': args.full_name}
+            words = args.full_name.split()
+            if len(words) == 2:
+                kwargs.update({'first_name': words[0], 'last_name': words[1]})
+            user.person = model.Person(**kwargs)
         session.add(user)
         session.commit()
         session.close()