Prearc Details Page -- Add Total File Count

This is a small prearchive feature that would help CNDA workflow immensely. It is not in the Qooxdoo portion of the code.

Example:
1. Go to prearchive.
2. Click on any session in "Ready" state in the prearchive.
3. To the upper right, there is a "Details" button, click it.
4. A screen will appear displaying a list of all the scans in the session. File counts for each scan are displayed.

Feature request: please add a total files number beneath the list. Our scan techs at the CCIR use this page to check their totals in the prearchive before archiving. They want to check by total files, not scan by scan.

Thanks!