Added a few more checks to the test_load_results() system test.
Updated the results file.
Print out clean up in load_pdb().
Converted set_error() to the new design.
Converted sim_return_chi2() to the new design.
Fix for the sim_return_param() method, the model_type variable was missing.
Converted the sim_return_param() method to the new design.
Fix for the sim_return_selected() method. The wrong argument was assumed.
Fix an incorrect data pipe reference in the minimise() function.
Changed a cdp.sim_state flag from an int to a bool.