Pv/misc
Created by: PhilipVinc
closes #826 (closed)
Renames netket.utils.mpi_available
to netket.utils.mpi.available
and update the documentation.
closes #814 (closed)
Renames TBLog
to TensorBoardLog
(+ deprecation)
remove a leftover old version of loggers from legacy that was not included in the other PR...