Continue JDBI work
Adding Intellij IDEA files to gitignore
Convenience script to migrate the DB
Stop passing around the tenant everywhere and retrieve it from context
instead
Continue JDBI move :
- Refactored the authorization module to have class and method level
  annotations instead of field level
- Deleted what remained of the DataNucleus module
More API cleansing
Exception clean-up + stop failing so hard when APIs are misused
Working version of product and category update
API to move categories one relative to another
Support for ordering of categories and products