#5 multi-threaded dspsr

[Willem van Straten]

It would be nice if a single dspsr process could be run on multiple CPUs/cores using multiple threads. These threads could share important resources, such as the FFT plans, dispersion kernel, and phase predictor, without the need for MPI. Potential trouble spots:

- a mutex would be required to protect shared resources during allocation/initialization;

- the InputBuffering system would have to implement a shared pool, such that each thread could store the data that it lost for use by other threads; and

- static variables, such as the Operation::workingspace, would have to be removed.

[Willem van Straten]

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Multi-threaded dspsr is pretty much working now and any problems should be registered as bugs.