Added functionality for order by columns
Added tests for the DAO Order By feature for the Sports Session tests.
Fixed naming of data source.
Locks a file and checks for the lock
Changed to use the newly implemented locking mechanism in order to limit its instances to 1.
Code refactoring.
Added order by parameters (column and ascending/descending flag) to the "getAll()" method.
-Begun building the AddEddit Client view.
-Added buttons to lead to the AddEdit Client view.
-Added table view for all the existing clients.