Allow std::string to be used in CS parsing and OStream wrapping.

Change-Id: Iaa0f1320fde61cb545c641d374e6da789b23960d
Create vtkPVPythonInformation and use it in the about dialog.

Ref #14614. Also remove python stuff from vtkPVServerInformation
that was added in last commit.

Change-Id: I73473138742e47cb4959f04fc598ce272d3c91c9
Merge topic '14614-report-numpy' into next

89d8afc6 Create vtkPVPythonInformation and use it in the about dialog.
13503ecc Allow std::string to be used in CS parsing and OStream wrapping.