Addition of LSQ12 application as a stand-alone program and related changes:
1. Moved LSQ12 class to LSQ12.py (and associated updates to calling classes)
2. Created FullLSQ12 class that includes creation of final average in addition to iterations.
3. Added scaleFactor to stats class as an argument. By passing in this transform, it will be included as part of scaled jacobian calculation. Default is none and only linear part of nlin transform is used.

Minor change:
Fixed error with self.epilog in AbstractApplication class.