processes sleeping in relion_reconstruct_mpi

I noticed recently that when running relion_reconstruct_mpi on our cluster (through slurm) that the processes went to sleep and stopped doing any work. Tracing them I found they seemed to have stalled trying to read from stdin ( read(0, )

I did a quick grep for cin in the code base and found one on line 702 of recponstructor.cpp. It didn't seem to me that this call was doing anything useful so I commented it out and re-compiled. This seems to have fixed the problem.

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