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nprof: estimate parameters for noise profiling

this output module fits a gaussian/poissonian noise model and creates noise profile files to be stored in ~/.config/vkdt/nprof or data/nprof/ and read back in by vkdt.

parameters

• test set the noise profile parameters in the file written out in the i-raw:main module for inspection
• install install the noise profile to the home directory
• remove remove the raw histogram and noise profile modules from the graph

connectors

• input the single-channel ui32 noise profile data from the raw histogram