Implemented the following functionality for MU2 - §170.314(a)(12) Image Results

1. Provision to tag the encounter to the uploaded document at patient/documents page.
2. Display the links to uploaded tagged documents in the encounter page.
3. Display the links to uploded tagged documents in the past encounter page.
4. New menu option "Documents" at Patient demographics left menu to view the documents uploded to the "Lab Report" category
5. Provision to preview the uploaded document as a tooltip at above Documents page.
fixes for prior commit - moved Documents menu item to Procedures->Lab documents