fixes not concerning graphics

- default is no graphics
- use send_file instead of response (proper mimetype)
- fix issues with parameter blocks

client/jsFiles/SEAWebClientResponsivity.js

@@ -69,7 +69,7 @@ function adjustGrid() {
 
     switch (nColumns) {
     case 1:
-       if (menuMode) {
+        if (menuMode) {
           leftWidth = Math.min(100, MINWIDTH / width * 100);
           style(0,leftWidth + "vw","100vh");
           style(1); // hide
@@ -147,4 +147,4 @@ function style(s, width, height) {
     elements[s].style.float = "left";
 }
 
-let isTouchDevice = !!('ontouchstart' in window) || !!('msmaxtouchpoints' in window.navigator);
+let isTouchDevice = !!('ontouchstart' in window) || !!('msmaxtouchpoints' in window.navigator);