Plugin name not being correctly accessed

[vsajip]

The name specified for a plugin seems not to be correctly accessed - it's not being read from the plugin_info's plugin_object, as it ought to be. Instead of

https://github.com/getnikola/nikola/blob/650b954294ab01627ba9b45d81835293a5e02bb8/nikola/nikola.py#L1152

it should be something like

          name = getattr(plugin_info.plugin_object, 'name', plugin_info.name)
          self._commands[name] = plugin_info.plugin_object

Similar logic needs to be applied for the activation, at

https://github.com/getnikola/nikola/blob/650b954294ab01627ba9b45d81835293a5e02bb8/nikola/nikola.py#L1321

which could be something like

          name = getattr(plugin_info.plugin_object, 'name', plugin_info.name)
          self.plugin_manager.activatePluginByName(name)