Remove jobOptions referring to other, non-existent jobOptions

Remove some of the jobOptions that include jobOptions that have been deleted from master. A couple of knock-on changes (e.g. MultiInputExample and Interpreters were not doing anything useful and have been removed entirely).

There are still hundreds of references to deleted files, as well as non-Python 3 conformant syntax in jO. But we can follow up on that in future.

Also to-do: share my script that does a git grep for include() and compares it with the contents of JOBOPTSEARCHPATH. Currently throws up some false positives but I have checked all of these by hand.