Reverted earlier change for MGED ontology related tests, as they now fail again

(need further investigation into whether it is a difference with the
online imports changing, or a difference in environment, and either way
find an alternative way of testing this)
Need to set flag to show error box, to enforce values from validation range in XLSX
Added a menu item for Registration and Feedback, that links to our onine registration form
Use Preferences to store the location of the last opened or saved file,

which is the default location next time prompted to open or save a file.
updated to latest owlapi libraries
tidied up test resource files, splitting ontologies and workbooks
put mocked bioportal responses for testing into their own folder
explicity state that an error box should not be shown for free text fields. This is to avoid an issue with libreOffice, and is probably a good idea anyway