Vtk precision fixes (#1141)
Vtk precision fixes (#1141)

* Changed vtk data types from float to double

* Correct types and max_digits10 for setprecision

* Added setprecision to vtk functions

* Fixed formatNaN to respect setprecision
MeteoSwiss-APN/dawn,MeteoSwiss-APN/dawn,MeteoSwiss-APN/dawn