vtkTimeSeriesReader should add physical time when available in field data
Currently the vtkTimeSeriesReader populates the time in the VTK pipeline with the index of the file in the sorted listed of files. The user should be able to select the field data that contains the physical time for each individual file aggregated by the vtkTimeSeriesReader. The entirety of every file should not be read to get the time values. Current solution requires the creation of a pvd file.