The overrides section of the smart class parameter page has become a bit of a maze of checkboxes and input boxes, and needs tidying up.

The main problems that I see are:

1. "Global" configuration for the behaviour of overrides (merging, "avoid duplicates", order) should be more separate to the list of matchers.
2. No separation between individual matchers, so what the "Use Puppet default" box applies to is unclear. Other forms in the app use horizontal rules to separate individual items.