major CRUD refactor

This is the start of a large refactor to move all entity CRUD (create,
read, update, delete) model/database code into it's own file.

HACKING has been updated with an overview of what happens in each file.

Next steps:
- split rev (and sub-table) insertion in to db_rev_insert and make
  create/update generic
- inserts should be batch (vector) by default
- move all other entities into this new trait framework
- bypass api_server wrappers and call into CRUD from api_wrappers for
  entity ops (should be a big cleanup)

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