Start to remove now dead classes.

* Model & ClassRegistry have been replaced by the new ORM.
* Old non-functioning behaviors have been removed. We can forward port
  behaviors as people have time to fix them.
* DbAcl & the AclShell rely on the old Model class - which has been removed.
* Scaffold relies on the old Model and needs to be rethought.
* Parts of bake have been neutered, they relied on Model which is now
  gone.
Fix & mark Console/ tests incomplete.

Fix a few of the console/ tests, mark the remaining ones as incomplete.
The incomplete tests rely on old the now removed model class.
Fix and remove failing View/ tests

Fix a few tests and remove/skip tests that rely on the now removed Model
class. These tests will need to be revisited soon.
Fix failing tests in AppTest.
Remove more references to Scaffold as it is dead for now.
Merge pull request #2496 from markstory/3.0-clean-dead-code

3.0 - Clean up dead/broken code