[Jprogramming] arrayfire addon updated

[Eric Iverson]

arrayfire addon updated with minor fixes

Main change is matmul now has wrappersfor best performance for either f64
or f32 (avoids expensive conversion of row major to column major with
square matrices by using matmul transpose flag).

Get started:
   load '~addons/math/arrayfire/arrayfire.ijs'
...
  init_jaf_ 'cpu' NB. or 'cuda' if you have an nvidia card can cuda
software installed
  tut_jaf_ '' NB. tutorials
...
  tut_jaf_ 'qmp' NB. matmul tutorial
...
   tut_jaf_'xaf_cpp' NB. c++ tutorial that opens up new possibilities
...