relax SVN archive

Changed all references to 'print_flag' to 'verbosity' in the user function arg unit tests.

Converted all the bin args (0/1) to bool args (True/False) in the minimisation user functions.

Created a new error type for booleans - RelaxBoolError.

Renamed 'print_flag' to 'verbosity' in the calc(), grid_search(), and minimise() user functions.

This arg is not really a flag, and it is the verbosity level, so this makes more sense.

The lower, upper, and inc args to grid_search() are no longer stored in the class instance.

Changed a few of the arguments of the N-state model grid_search() function.

The 'print_flag' arg has been renamed to 'verbosity' and the 0/1 args have been converted to
True/False args.

Changed a few of the arguments of the N-state model minimise() function.

The 'print_flag' arg has been renamed to 'verbosity' as it really isn't a flag. And the 0/1 args
have been converted to True/False args.

Added code to fetch the initial parameter vector.

Adapted, for the consistency_tests code, 2 more RSDM unit tests for the setting of parameters.

dapted, for the consistency_tests code, 5 more RSDM unit tests for the setting of parameters.