returns scilab mode
m = getscilabmode()
Returns scilab mode. 4 modes are possible: "STD", "API", "NW", "NWNI".
"API": Scilab is launch as an API.
"STD": the standard Scilab (gui, plot ...).
"NW": Scilab in command line with the plots.
"NWNI": Scilab in command line without any graphics.