add VTK easyconfigs for gnu & intel builds

Signed-off-by: Fotis Georgatos <fotis.georgatos@uni.lu>
added v5.4.2 in the altversions list

Signed-off-by: Fotis Georgatos <fotis.georgatos@uni.lu>
Merge pull request #122 from fgeorgatos/contrib_VTK

100_contrib_vtk