relax SVN archive

Removed the model_index arg from model_type().

Activated the specific model_type() method.

Created the model_type() method to determine whether the model is local or global.

Renamed the duplicate_data() arg model_info to model_index.

Fix for the determination of the global_stats flag in model_statistics().

Converted the rest of the model selection to the model_loop() design.

The following model-free methods have been converted to using the model_loop():
duplicate_data()
model_statistics()
skip_function()

Shifted to the use of the model_loop().

Created the new specific method model_desc() for returning a human readable model description.

This will be used in the model selection printouts.

Removed all references to 'run' and removed some useless comments.

Updated the ancient palmer.py sample script to the new design.