Refactoring of mxModel extract and replace methods, but not yet allowing '$' as an operator on models.
Refactoring of mxModel extract and replace methods,
but not yet allowing '$' as an operator on models.


git-svn-id: b6c97393e82be3812a607970066d172a5388f86f@292 df83fd30-4cca-4c36-ab9d-e8b5583ccbd1

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