####### constrained minimization ###### F90 translated version of plato.asu.edu/ftp/other_software/bobyqa.zip Powell 2009 Method http://www.damtp.cam.ac.uk/user/na/NA_papers/NA2009_06.pdf AL Sept 2012: translated to F90, changed to input "funkk" function argument to minimize rather than calfun subroutine