Updated DB changes: set AtoM DIP upload defaults.

Added DB changes to set defaults in the updated AtoM DIP upload
configuration administration.
File browser can receive directory metadata.

Added logic to the client-side file browser so when it does AJAX
requests for directory data it can receive directory metadata and
assign it to its internal representation of the directory.
Directory AJAX feed provides directory metadata.

Updated the AJAX feed for providing SIP arrange directory data
with level of directory metadata.
Display level of description in SIP arrange.

Updated client-side UI logic to display level of description for
directories.
Re-enabled editing of file metadata.
Fixed issue with unsetting level of description.

Fixed issue where an error is generated and the user saves a blank
level of desription in the SIP arrange UI.
Enforce valid user interaction in arrange panel.

Added disabling of SIP arrange panel action buttons when the user has
highlighted an item that the action should not apply to (creating
directories within files, for example).

Added an error alert in the SIP arrange UI if someone tries to
create a directory within a file.

Commented and cleaned up JavaScript.
Minor CSS tweak to SIP arrange paging links.
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.