This commit adds a new module, ParaViewCore/VTKExtensions/CosmoTools,
which brings in built-in support for CosmoTools readers and filters.
This module is targeted only for Unix platforms and requires, MPI,
GenericIO and the underlying CosmoTools library.

Change-Id: I571cf77510ac3d07c1c2596d25019f8b2f1191b2