[Paraview] Errors when using find_package(ParaView REQUIRED)

[Utkarsh Ayachit]

> Note: The cmake code for those plugins has not yet been updated to
> work in VTK6/PV4 but making the VTK level directory a standard module
> should simplify things significantly (I hope).

Dramatically! Look at this commit:

http://paraview.org/gitweb?p=ParaView.git;a=commitdiff;h=0d8423b27b1146af926a8950fd515fe188e7f1ee

Utkarsh