Add ability to delete (unused) item categories

[cielf]

Summary

Add the ability to delete item categories that are not used

Why?

Banks add categories in error sometimes, and would like to be able to clean them up (specific support request 20241004)

Details

The place this should go is reached by: signing in as [email protected], click "Inventory", then "Items&Inventory" in the left hand menu, then click the "Item Categories" tab.

For any item category that is not in use (has no items associated with it)
Add a delete button to the Items Category tab
This will ask for confirmation that the person wishes to delete that category (give the name). Once confirmation is given, it will check whether the category is used on any items, and if not, will delete it.

Criteria for completion

• behaviour as described above
• tests to confirm behaviour
• update user guide to reflect the new behaviour

[leslie-seeberger]

I'd like to take this one.

[cielf]

Please do!