Minor devtool / recipetool fixes

index ff368dc..63d2ef9 100755
@@ -179,13 +179,16 @@ def _create_workspace(workspacedir, config, basepath):
         # Add a README file
         with open(os.path.join(workspacedir, 'README'), 'w') as f:
             f.write('This layer was created by the OpenEmbedded devtool utility in order to\n')
-            f.write('contain recipes and bbappends. In most instances you should use the\n')
+            f.write('contain recipes and bbappends that are currently being worked on. The idea\n')
+            f.write('is that the contents is temporary - once you have finished working on a\n')
+            f.write('recipe you use the appropriate method to move the files you have been\n')
+            f.write('working on to a proper layer. In most instances you should use the\n')
             f.write('devtool utility to manage files within it rather than modifying files\n')
             f.write('directly (although recipes added with "devtool add" will often need\n')
             f.write('direct modification.)\n')
-            f.write('\nIf you no longer need to use devtool you can remove the path to this\n')
-            f.write('workspace layer from your conf/bblayers.conf file (and then delete the\n')
-            f.write('layer, if you wish).\n')
+            f.write('\nIf you no longer need to use devtool or the workspace layer\'s contents\n')
+            f.write('you can remove the path to this workspace layer from your conf/bblayers.conf')
+            f.write('file (and then delete the layer, if you wish).\n')
             f.write('\nNote that by default, if devtool fetches and unpacks source code, it\n')
             f.write('will place it in a subdirectory of a "sources" subdirectory of the\n')
             f.write('layer. If you prefer it to be elsewhere you can specify the source\n')

index a2516d6..ed49a93 100644
@@ -1304,14 +1304,15 @@ def reset(args, config, basepath, workspace):
         if args.all:
             raise DevtoolError("Recipe cannot be specified if -a/--all is used")
         else:
-            check_workspace_recipe(workspace, args.recipename, checksrc=False)
+            for recipe in args.recipename:
+                check_workspace_recipe(workspace, recipe, checksrc=False)
     elif not args.all:
         raise DevtoolError("Recipe must be specified, or specify -a/--all to "
                            "reset all recipes")
     if args.all:
         recipes = list(workspace.keys())
     else:
-        recipes = [args.recipename]
+        recipes = args.recipename
 
     if recipes and not args.no_clean:
         if len(recipes) == 1:

@@ -1449,9 +1450,9 @@ def register_commands(subparsers, context):
     parser_status.set_defaults(func=status)
 
     parser_reset = subparsers.add_parser('reset', help='Remove a recipe from your workspace',
-                                         description='Removes the specified recipe from your workspace (resetting its state)',
+                                         description='Removes the specified recipe(s) from your workspace (resetting its state back to that defined by the metadata).',
                                          group='working', order=-100)
-    parser_reset.add_argument('recipename', nargs='?', help='Recipe to reset')
+    parser_reset.add_argument('recipename', nargs='*', help='Recipe to reset')
     parser_reset.add_argument('--all', '-a', action="store_true", help='Reset all recipes (clear workspace)')
     parser_reset.add_argument('--no-clean', '-n', action="store_true", help='Don\'t clean the sysroot to remove recipe output')
     parser_reset.set_defaults(func=reset)

index 2723491..ab77a2d 100755
@@ -213,6 +213,7 @@ def main():
     parser.add_argument('-s', '--skip', help='Skip specified recipes (comma-separated without spaces, wildcards allowed)', metavar='PNLIST')
     parser.add_argument('-c', '--skip-classes', help='Skip recipes inheriting specified classes (comma-separated) - default %(default)s', metavar='CLASSLIST', default='native,nativesdk,cross,cross-canadian,image,populate_sdk,meta,packagegroup')
     subparsers = parser.add_subparsers(title='subcommands', metavar='<subcommand>')
+    subparsers.required = True
 
     parser_modify = subparsers.add_parser('modify',
                                           help='Run "devtool modify" followed by a build with bitbake on matching recipes',

index 63d2ef9..a93a11f 100755
@@ -301,6 +301,7 @@ def main():
         tinfoil.shutdown()
 
     subparsers = parser.add_subparsers(dest="subparser_name", title='subcommands', metavar='<subcommand>')
+    subparsers.required = True
 
     subparsers.add_subparser_group('sdk', 'SDK maintenance', -2)
     subparsers.add_subparser_group('advanced', 'Advanced', -1)

index 0e8bffb..17233d4 100755
@@ -60,6 +60,7 @@ def main():
     parser.add_argument('-h', '--help', action='help', default=argparse.SUPPRESS,
                         help='show this help message and exit')
     subparsers = parser.add_subparsers(title='subcommands', metavar='<subcommand>')
+    subparsers.required = True
 
     if global_args.debug:
         logger.setLevel(logging.DEBUG)