Configure the max number of tabs

Workflow Manager offers two configurations - for the number of tabs (open exams) that can be open - five or unlimited

With unlimited there is a chance, based on machine resources that a maximum may be met and errors from the viewer raised.

The request is to provide a configurable number of maximum tabs, i.e. 10. Any number can be specified, less than 100. The UI would continue to handle memory issues that occurred with unlimited.