Develop

Updated prototype for OpenCL, Changes since last email...
   Fit Kernel time reduced from 19s to 4s.  
          (x*x instead of pow(x,2) and exp10(a) instead of pow(10,a))
   df checking time reduce from 24s to 15s.
          Used kernel to calculate df and return bitwise packed binary.
   Still working on reducing histogram data, reducing one element (pa) around 
   10s kernel time at the moment.  Needs to be 5 times faster to match cpp reduction.