HistorianView: Fixed timestamp alignment in export to fill in gaps where data is missing.
HistorianView: Fixed timestamp alignment in export to fill in gaps where data is missing.

git-tfs-id: [https://tfs.codeplex.com/tfs/TFS07]$/gsf/Main;C89507

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