testMaker Code

On deletion pages, display warning about disabling whenever applicable.

Add infrastructure to better detect whether structure needs to be tracked.

For structure changes, we now consult all tests that contain the object in
question and update their structures if required.

Also, a couple of new doc comments.

Add more support for read-only mode.

Clean up and clarify modification warnings on lots of editor pages.

Properly handle and display disabled item answers.

Introduce read-only mode for BlockPage descendants to handle disabled objects.

Fix typo in disabling support for item answers.

Enables the user to get a complete list of email addresses an email will be sent to

Restructure handling of adaptive test sessions.

We now update the test run's structure directly after an answer has been
processed and take care to supplement this with proper handling in
TestRun::getCurrentItems, e.g. randomizing first item.

Discrimination value of adaptive test item must not be zero.