Add "pixelaspect" command.

src/partiview.cc

@@ -965,6 +965,14 @@ int pp_parse_args( struct stuff **, int argc, char *argv[], char *fromfname, voi
 
 	msg("stereo %s", parti_stereo(NULL));
 
+  } else if(!strcmp( argv[0], "pixelaspect" )) {
+	if(argc > 1) {
+	    float pixasp = atof(argv[1]);
+	    if(pixasp != 0)
+		parti_setpixelaspect( pixasp );
+	}
+	msg("pixelaspect %g", parti_getpixelaspect());
+
   } else if(!strcmp( argv[0], "winsize" )) {
 	msg("winsize %s", parti_winsize( rejoinargs( 1, argc, argv ) ) );