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vtkIOSSReader: Performance Improvements

Spiros Tsalikis requested to merge spiros.tsalikis/vtk:ioss-release-regions-when-needed into master

vtkIOSSReader has the following performance improvements:

  1. ioss::Regions are now released only when a new restart file is about to be read.
  2. When Caching is off, cache is cleared when a new restart file is read.
  3. ReadAllFilesToDetermineStructure is now off by default.
    1. Internally, a check is performed to let the user know if this flag needs to be turned on.

This MR resolves paraview/paraview#22572.

Edited by Spiros Tsalikis

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