New schemas for classifications and classification terms.
First go at specs, database and factory setup
Add a first attempt at the Classification model
Added implementation of classification_term and classification_tree
Uniqueness checking for identifiers and titles in classification terms
Add endpoints for classifications and classification terms
Throw a nicer error if lock_version is missing
Description shouldn't be required
classification should be required for classification_terms
Add classification & classification_term to the index
Add Classification/Term frontend as per Resource/Component
Use the right table for classification terms
Add agent linker to classification/term forms;
Change the classification icon
Fix readonly views for classification/terms and delete
Added unique position constraint for classification terms
Avoid DB length limits by using title_sha1 for uniqueness checks.
Another 'orderable' bug fix
Validate orderable records in their new position before saving
No need to clone the object, actually