Damaris initialization is added after InitMpi but before starting the simulation. Damaris will invoke a separate core for writing in
parallel and leave the rest of cores for the simulator. The main changes are in main where start_damaris and then in eclwriterm where
we use damaris to output the PRESSURE. To test Damaris one can use --enable-damaris-output=true and to use parallel HDF5 one can use
--enable-async-damaris-output=true (false is the default choice)
