Fixed CSV import issue with levelOfDetail column.

refs #5063

Fixed an issue with the CSV import logic for information objects. If the
levelOfDetail column was present, but contained blank values, the import
would abort.
Fixed issue with CSV import descriptionStatus column.

refs #5064

If the descriptionStatus column with included in the import, but blank,
the import would fail.
Fixed issue with CSV importing objects.

refs #5065

Fixed issue where if physicalObjectLocation and physicalObjectName aren't
both set it silently fails. Added explicit error.
Added CSV import support for date edge case.

refs #5067

Added logic so if creator dates are imported, but no creator
is specified, it will still work (as it does via the AtoM web
interface).
Add license
Remove related events on repo deletion, fixes #641

Same that actor/actions/deleteAction.
Show import links only to admins, fixes #4737
Made QubitTerm::ROOT_ID default parent_id

New QubitTerms created by CSV imports now have
a default parent_id of QubitTerm::ROOT_ID.
Change edition statement tooltip in RAD template

Fixes #4760.
Show name of levelOfDescription, fixes #4550
Show always treeview popout in IE10