Create ability to see edit Issue Hours in the work load balancer - same as task hours can be edited. This is needed to agile teams to manage backlog workloads

Currently the workload balancer does not permit issue hours to be modified per user/per day - the same way task hours can be edited. This is needed for Agile functionality so backlog work can be assigned - with specific hours per day during the iteration period. Currently the planned hours can only be rearranged - This doesn't permit true resource utilization data.