- remove UNIQUE constraint on named keys from tables that support

- remove UNIQUE constraint on named keys from tables that support
  marking records as deleted (e.g. persons.email should not be unique;
  even (persons.email, persons.deleted) should not be unique, since the
  same person could conceivably register and delete their account
  multiple times). Instead, just add an index on these fields.
- add indices to join tables
- sites: add max_slivers attribute
- get rid of address types, leave it to the application to decide how
  address types should be used
- get rid of person/account addresses, just add site addresses
- node_nodenetworks: order by is_primary
- add slice and sliver tables
- remove .* from all views per jonesy recommendation