minor, AC_ARG_VAR MATLABPATH variable to allow customised setting
minor, AC_ARG_VAR OCTAVEPATH variable for symmetry
fix, PEBKAC, actually rename the mex files at hand
Merge branch 'core/mex-iter'

* core/mex-iter:
  fix, PEBKAC, actually rename the mex files at hand
  minor, AC_ARG_VAR OCTAVEPATH variable for symmetry
  minor, AC_ARG_VAR MATLABPATH variable to allow customised setting