Enable cross-origin requests
Refresh model from input form changes
More puny attempts to improve interface
Remove the isNew() checks before creating/updating

They don't make sense for the kind of UI that we are building, where the ID has
to be set to read something specific.
Finally, working properly on the client side

- Guard the model from having the ID set when rendering.
- Don't CREATE with an ID, or UPDATE without it. Prompt the user to set it or
  clear it.
- Fix the events to allow clearing the values, specially the ID.
Restore the user model JSON at startup
Support CREATE with "emulate JSON" option
Update the model in the server
Fix indentation
Oops, active -> enabled
Forgot to support the "enabled" attribute
Refactor syncModelAttributes
Remove placeholders, since actually look confusing
And display the enabled flag in the checkbox
Implement deleting an entry