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Updates for COB-85

Bram Veenboer requested to merge cob-85-master into cob-master

This is a merge request for a number of changes to the GPUProc code related to COB-85.

The most important changes are as follows:

  • A SubbandProc processes only one SAP (beam) at a time and therefore executes at most one Coherent Stokes and one Incoherent Stokes beamFormer
  • Reduce excessive memory allocation (related to the above point)
  • Add initial gpu_load_lmm program designed to test lmm parsets
  • Update buffer management when quantization is enabled: no DtoD copy, but reuse of the existing devE buffer
  • Add correlatorEnabled option to Parset
  • Move gpu::Marker code from SubbandProc::process to ProcessStep
  • Make SubbandProc::process suitable for asynchronous execution, saving a lot of idle time

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