Histogram enabled ffa
Little actual ffa usage, just the port to 'sizet, method and use of #'mpointer in the histogram context. It would be nice to be able to adapt defmfun to discriminating between 1d and 2d histograms rather than using histo-1d2d, but I will put that off for now. This compiles but is not tested.
Showing with 98 additions and 121 deletions