show full path of file in object detail view

[DRiKE]

In the detail view currently only the basename of the file is displayed (in bold, at the top of the detail view). Including the full path would provide useful context.

• Backend: needs to include the full path in the JSON response, instead of (or in addition to?) only the basename
• Frontend: display the full path, perhaps in a smaller font size, directly under the bold basename?

[DRiKE]

Responses of ObjectDetail calls now include path, which is the full path up until (thus excluding) the basename: this way, the path field can hopefully be used to easily solve #18 as well.

For this issue, the path and filename in the response should be combined by the front-end and displayed as described above.