Revise HTML patient export for portfolio users

Change the "export patients" workflow for users with the `portfolio` role. Users with this role will now get patient information including details across measures, rather than simply details for the measure from which the export was triggered.

**Note:** my knowledge in this domain is extremely limited: would a `portfolio` user always want this type of export information? Or would it be pertinent to add some sort of facility for `portfolio` users to specify whether or not they want the patient data within the scope of the current measure?

**Note 2:** I'm still looking into adding test support for this in `test/functional/patients_controller_test.rb`