Phenix tutorial: phenix.refine using default values (GUI)

This tutorial explains how to run phenix.refine in the GUI using default values. ----------------- Phenix.refine documentation page: https://www.phenix-online.org/documentation/reference/refinement.html ----------------- Phenix.refine documentation for the GUI: https://www.phenix-online.org/documentation/reference/refine_gui.html ----------------- References: http://scripts.iucr.org/cgi-bin/paper?S0907444912001308 http://scripts.iucr.org/cgi-bin/paper?S0907444911047834 http://scripts.iucr.org/cgi-bin/paper?S0907444913000462 http://scripts.iucr.org/cgi-bin/paper?S0021889809023528