relax SVN archive

Modified generate_spin_id() to handle None and int entries in the data array.

Modified the model-free minimise() function to print out the spin_id rather than res name and num.

Updated the return_spin_from_index() function to return the spin_id string if asked.

Converted the model-free linear_constraints() method to the new relax design.

Fix in the assemble_scaling_matrix() docstring.

Passed the scaling matrix into the grid_search_config() method.

Added the missing self arg to test_grid_size().

Added the missing self arg to a number of grid search methods.

Passed the lower, upper, and inc variables into grid_search_config().

A number of modifications to get the grid_search_config() method to work.