* add can_access_data_model key to api/user/current

* add exclude_uneditable flag to /api/database/:id/metadata

* clean ns

* WIP figuring out how to update perm checks for Field model

* fix errors

* fix more errors

* tests for field APIs

* table perms changes

* tests for table API

* fix function call

* clean ns

* perm enforcement for other table APIs

* perm enforcement for other field APIs

* address comments