adjusted various details:

- changed floppiness implementation
- changed default flopiness
- made heaband rounder
- added hingetest

hingetest.scad

@@ -0,0 +1,12 @@
+use <hinge.scad>;
+
+union(){
+    translate([7,0,0]){
+        cube([5,47,6]);
+    }
+    hinge(15,0,0);
+    translate([0,10,0]) hinge(30,0,0);
+    translate([0,20,0]) hinge(45,0,0);
+    translate([0,30,0]) hinge(60,0,0);
+    translate([0,40,0]) hinge(90,0,0);
+}