Created two new files in directory scr_GUI and made many changes in main_GUI.py
Changed dir name scr_GUI to scr
Added ploting options in main_GUI.py
Moved see_SPND_plot in the main directory
see_SPND_plot.py renamed to view_SPND_plot.py
Added SPND plot to main.py and main_GUI.py
Added one SPND name exeception