Fixed implementation of error reporting. Made all formats be compared with cuSPARSE (format and cuSPARSE compared to CPU, not between each other, that would require Benchmarks.h to be changed). Added name of mtx being tested to MetaDataColumns. Code reformatting.

Found potential mistake in SpMV/spmv.h where MatrixReader doesn't need to be called twice. Commiting to show in meeting.

Implemented rough version of result comparison. Implemented benchmark for comparison of TNL CSR and Cusparse on GPU. Edited log file formatting.

Implemented for the benchmark to write the output of MatrixReader into the log file. BUG: Every other error message added into the Benchmark doesn't have a '!' as a prefix in the log file.

Copied tnl-benchmark-spmv files and spmv.h from BLAS to SpMV. Deleted min/max size and stepFactor. Not working yet, backup purposes.

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

Added triad benchmark (copy to device, compute, copy to host) using different memory management strategies

fixes #23

fixes #21

Calculation of bandwidth broke in commit fb97bcd0

Check of MpiCommunicator::IsInitialized is necessary because
non-distributed benchmarks like tnl-benchmark-blas do not initialize
the communicator.