[Paraview] Change to Show Times from PVD Files

[Kent Eschenberg]

With these changes the times from a pvd file will be displayed as an annotation.

The times provided by the pvd reader will be initialized to the integer index of the timestep (0, 1, 2, ...). However, if you add the attribute "timevalue" to the "DataSet" tag then the timevalues will be used instead. A line in the pvd file that uses
this feature would look something like this:

   <DataSet timestep="2" timevalue="0.03" part="9" file="time2/part9.vtu"/>

Tested with version 2.4.4. The following files are attached:

   <source>/Servers/Filters/vtkPVDReader.cxx
   <source>/Servers/Filters/vtkPVDReader.h
   <source>/Servers/ServerManager/Resources/readers.xml

Kent
Pittsburgh Supercomputing Center
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