vtkIOADIOS: Fix incorrect multi-block multi-step scalar values.

Use a diferent mechanism and API within ADIOS to parse out scalar data

Change-Id: If863f17d126f5f7d2d8a1d183576126734957136
vtkIOADIOS: Ensure time values always get written, even if just the step.

Change-Id: I3dc56f7d90b83953560691a014c6dc2ef9462063
vtkIOADIOS: Collection of small fixes

- Fix incorrect attribute label for NumberOfPieces
- Fix bad extent types and remove dead WholeExtent code
- Comment out debug messages

Change-Id: I2b723684eaa479d64b3a611ea6b7565f9d7b06aa
Merge topic 'misc-adios-fixes' into master

1a8ba956 vtkIOADIOS: Collection of small fixes
2b27d502 vtkIOADIOS: Ensure time values always get written, even if just the step.
ba13e889 vtkIOADIOS: Fix incorrect multi-block multi-step scalar values.