Remove vtkPVConfig.h include and precision macro
Remove vtkPVConfig.h include and precision macro

vtkPVConfig.h is no longer needed since it was only used for the
precision macro.

Also, since the precision macro is only used in one place, remove it
and just use the number manually. Also use "8" for the precision
since that is probably enough.

Signed-off-by: Patrick Avery <743342299f279e7a8c3ff5eb40671fce3e95f13a@kitware.com>

OpenChemistry/tomviz,OpenChemistry/tomviz,OpenChemistry/tomviz,OpenChemistry/tomviz