1. Change the display and behavior of Nurseries & Trials Tab in Dashboard to display all nurseries and trials of a program under one root folder "Nurseries And Trials".
2. Make all displayed nurseries and trials editable.
3. Allow folders to be added to any items in the tab.
4. Allow items to be deleted in the tab except for the root folder "Nurseries And Trials" and those with children.
5. Allow all non-folder nurseries and trials to be launched.
6. Add Junit tests for revised methods with logic changes.

Reviewer: Crisjaira Villarino (post-commit)

BMS-216