mxGenerateData should always return a data.frame (try#2)
mxGenerateData should always return a data.frame (try#2)

There really isn't much point in failing when we can
just coerce the data type.

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