HistorianView: 1) Removed Display column in DataGrid. The export column alone determines which points to export or trend. 2) Modified the export functionality to take into account the possibility that duplicate data may exist for a signal at a given timestamp.
HistorianView:
1) Removed Display column in DataGrid. The export column alone determines which points to export or trend.
2) Modified the export functionality to take into account the possibility that duplicate data may exist for a signal at a given timestamp.

git-tfs-id: [https://tfs.codeplex.com/tfs/TFS07]$/gsf/Main;C83959

GridProtectionAlliance/gsf,rmc00/gsf,GridProtectionAlliance/gsf,GridProtectionAlliance/gsf,rmc00/gsf,GridProtectionAlliance/gsf,GridProtectionAlliance/gsf,rmc00/gsf,rmc00/gsf,GridProtectionAlliance/gsf,rmc00/gsf,rmc00/gsf,GridProtectionAlliance/gsf,GridProtectionAlliance/gsf,rmc00/gsf