New features

- Made the automatically added URI field optional to avoid having save-errors for freeterms
- Added an option to preserve old concepts as freeterms instead of deleting them during the import process + improved the delete batch logic
- Added an additional check for terms with the same label (but no URI) when choosing to update an existing taxonomy term instead of creating a new one
- Added a new feature that allows a user to select additional data for the taxonomy
- Resolved two bugs when exporting a vocabulary into the PoolParty

Fix for adjustment form.
Cleaned up the Inventory Item and Inventory location forms.

Display changes if initial state evaluates to FALSE.