Added vero_bed config option for huxley.

Moved screw sizes to vitamins.scad so it can be used stand alone.
Added capped option to hole_support.
Fixed bug in rounded_cylinder().

dibond/stls/printed/wades_extruder.stl

@@ -3761,10 +3761,17 @@ solid OpenSCAD_Model
   facet normal 1.15659e-005 -1 2.563e-006
     outer loop
       vertex 106.939 9.53672e-007 14.8407
-      vertex 107.06 1.4732e-012 13.9238
+      vertex 107.06 0 13.9238
       vertex 106.939 9.53674e-007 14.8407
     endloop
   endfacet
+  facet normal 3.98948e-006 1 -5.14922e-007
+    outer loop
+      vertex 106.939 9.53672e-007 14.8407
+      vertex 107.06 1.4732e-012 13.9238
+      vertex 107.06 0 13.9238
+    endloop
+  endfacet
   facet normal 0.991443 0 -0.130537
     outer loop
       vertex 106.939 9.53674e-007 11.1593
@@ -3793,13 +3800,6 @@ solid OpenSCAD_Model
       vertex 106.999 3 14.3823
     endloop
   endfacet
-  facet normal 3.9895e-006 1 -5.14922e-007
-    outer loop
-      vertex 106.939 9.53674e-007 14.8407
-      vertex 107.06 1.4732e-012 13.9238
-      vertex 107.06 0 13.9238
-    endloop
-  endfacet
   facet normal 0.991443 0 -0.130537
     outer loop
       vertex 106.999 3 11.6177

dibond/stls/wades_block.stl

@@ -1441,7 +1441,7 @@ solid OpenSCAD_Model
       vertex 106.739 3 10.2565
     endloop
   endfacet
-  facet normal 0.953721 0 0.300692
+  facet normal 0.953721 -0 0.300692
     outer loop
       vertex 106.461 9.53673e-007 16.6254
       vertex 106.739 0 15.7435
@@ -1595,7 +1595,7 @@ solid OpenSCAD_Model
       vertex 106.939 9.53672e-007 11.1593
     endloop
   endfacet
-  facet normal 1 -0 0
+  facet normal 1 0 0
     outer loop
       vertex 106.739 9.53672e-007 15.7435
       vertex 106.739 9.53674e-007 15.7435