correcting data in normalization report

Refs #6352

Data about normalization for access was switched with data for normalization for preservation.
Now corrected.
ingest/views: Fix trailing references to get_directory_name()

This specific form of it was renamed to get_directory_name_from_job(),
and get_directory_name() became a more generic version. Since a few
references were left over and still passed in Job objects, however,
they ended up returning weird results.
Metadata edit form: remove unused dropdown

This was added in SVN revision 2185 (984cb223052c0690bae60412a18d9c6bbfcd9326),
and appears to be reserved for a feature that wasn't implemented.

Since it's not useful for the version of the feature being added soon,
and it's confusing, it's best just to remove it.
DmdSec ID is on structMap objects div

refs #6479

When Dublin Core metadata is created, put the returned DMDID onto the
objects directory div element of the structMap.  Previous changes had made
structMapDiv point to a different element.
adding unique=True to Events model

required so the Events model will validate