Move the user table into a new schema, so that default mutations are not generated on the user tables

[ortonomy]

postgrahpql generates some really useful CRUD operations on each table in the schema that is set in the connection string the postgraphql server.

However, specifically for users (registration, update, delete, login) we'll want custom functions. The only way to do this is to 'hide' the user tables out of the schema that the connection string specifies.

Likely we'll have

flingapp[.userfunction] (anon, user, admin access) does stuff in flingapp_hidden (user, admin access) does stuff in flingapp_private (admin access)

[ortonomy]

Changed the listing so it's

flingapp[.user_function] (anon, register, login) does stuff in flingapp_custom[.function] does stuff in flingapp_private[.function]

[ortonomy]

Done!