Consistently use the browser's pointer cursor

(before it was a random mix of browser pointer and custom pointer)

css/55_cursors.css

@@ -101,6 +101,5 @@
 
 .turn rect,
 .turn circle {
-    cursor: pointer; /* Opera */
-    cursor: url(img/cursor-pointer.png) 6 1, pointer; /* FF */
+    cursor: pointer;
 }

css/80_app.css

@@ -116,8 +116,7 @@ button,
 .checkselect label:hover,
 .opacity-options li,
 .radial-menu-item {
-    cursor: pointer; /* Opera */
-    cursor: url(img/cursor-pointer.png) 6 1, pointer; /* FF */
+    cursor: pointer;
 }
 
 h2 {