DE6928, DE6929, DE6930, DE6931

DE6928	Remove user stories completed and user stories accepted columns

DE6929	Planned Story Points value changes when stories are removed from
the iteration at the end of the iteration. This make Velocity% and
Target Utilization % unreliable
To fix:
 - Change the name of the column to LPC Velocity
 - Create a field on the Iteration Reporting story within the iteration to report LPC Velocity. Scrum Masters will fill this value in
 - Populate the values in the LPC velocity column from Iteration Reporting story

DE6930	Target Utilization % should equal (LPC Velocity / PlannedVelocity) * 100

DE6931	Velocity % should equal ( Accepted Points / Planned Velocity) *100