Moved (most of) static methods from TNL::Devices::Cuda as free functions into separate namespace TNL::Cuda

The class TNL::Devices::Cuda was too bloated, breaking the Single
Responsibility Principle. It should be used only for template
specializations and other things common to all devices.

The functions in MemoryHelpers.h are deprecated, smart pointers should
be used instead.

The functions in LaunchHelpers.h are temporary, more refactoring is
needed with respect to execution policies and custom launch parameters.

Fixes #46

The implementation for std::string (which is a base class of
TNL::String) is perfectly sufficient.

Fixes #11

Hamilton jacobi rebase

See merge request !43

Matouš Fencl authored Feb 19, 2019 and Tomáš Oberhuber committed Sep 25, 2019

MPI implemented for CPU and GPU in 2D but meshFunction.template synchronize< Communicator >(); doesn't copy overlaps.

StaticArrayAssignment expects the arguments passed as reference.

Tutorials

See merge request !41

Added command line parameter --tests-jobs to build script to set number of processes for unit tests.