issue2550983 - help_commands_html unused

Make the command htmlhelp trigger the command.

The output is ugly however. But clean this up and we could generate
html docs for the current admin.py version replacing existing docs
similar to how the doc is now done for config.ini.

Author: rouilj

roundup/admin.py

@@ -2195,6 +2195,10 @@ def run_command(self, args):
             self.help_all()
             return 0
 
+        if command == 'htmlhelp':
+            self.help_commands_html()
+            return 0
+
         # figure what the command is
         try:
             functions = self.commands.get(command)