Added logic to disable action buttons in the SIP arrange
panel when conditions for the action are unsuitable.
Commented and cleaned up JavaScript.
Fixed issue with file explorer ad-hoc properties.

Fixed an issue where if ad-hoc properties aren't found, it caused an
error.
Auto-search transfer backlog in originals panel.

If a open opens the originals file browser and the transfer backlog isn't
yet searched, trigger a search.