FIM method implemented for 2D GPU and FIM-FSM implemented for 2D CPU (parallel).

FIM method implemented. Neighbours are being found on CPU. 3D parallel method disabled because of Array changes.

This way they can use either yes/no, on/off, or true/false.

Why do problems have this method anyway? It was obviously never used...

When type traits for the "double-float" or "double-double" types are
needed, they should be added as specializations of the
std::numeric_limits template in some of the TNL header files.