Update Objects with Digital Object to Include More Levels

Description: Add more levels so that objects with digital objects can have the "View Online" button. The following levels should be included:

1. item
2. file
3. otherlevel
4. series
5. subseries

Documentation (More Info): Currently, the logic of whether or not an object gets a "View Online" button is: Does it have a link? Is it an "item"? This logic leaves out 1000s of other objects that are listed as different levels, such as "file", "otherlevel", "subseries". Including those levels would make it easier for users to access the digital content for that particular object.