Fixed bug in row/column order.

Using subsampling in fit_wrapper to match the executable default.
Organized the fit_wrapper a bit.
Added ModelDescription class to replace config files in the fitting process.

Added fit_config_file function to compare the results to the ModelDescription version.
Refactored ModelDescription. Now str(model) retuns a valid config file.

Added config file loader.
Fixed model string representation.
Check for contiguous array in a proper way.

Fit routine less verbose by default.

Update ModelDescriptior property values after fitting.