Add mxSimplify2Array for irregular length vectors
Add mxSimplify2Array for irregular length vectors

Also see https://bugs.r-project.org/bugzilla3/show_bug.cgi?id=15820

git-svn-id: b6c97393e82be3812a607970066d172a5388f86f@3549 df83fd30-4cca-4c36-ab9d-e8b5583ccbd1

jpritikin/OpenMx,JuKa87/OpenMx,jpritikin/OpenMx,JuKa87/OpenMx,mhunter1/OpenMx,JuKa87/OpenMx,JuKa87/OpenMx,mhunter1/OpenMx,mhunter1/OpenMx,jpritikin/OpenMx,jpritikin/OpenMx,jpritikin/OpenMx,jpritikin/OpenMx,mhunter1/OpenMx,mhunter1/OpenMx,mhunter1/OpenMx,JuKa87/OpenMx,JuKa87/OpenMx