add new print-friendly folder, and update rbuild accordingly. also refactor+fix xBar

rack/print/hingeModule_P1.scad

@@ -0,0 +1,5 @@
+include <../side/hingeModule.scad>
+
+// Oriented for 3d printing.
+// Supports generally not required (? need to print to test)
+hingeModule();

rack/print/hingeModule_P2.scad

@@ -0,0 +1,6 @@
+include <../side/hingeModule.scad>
+
+// Oriented for 3d printing.
+// Supports generally not required (? need to print to test)
+mirror(v=[1,0,0])
+hingeModule();

rack/print/magnetModule_P1.scad

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+include <../side/magnetModule.scad>
+
+// Oriented for 3d printing.
+// Supports generally not required (? need to print to test)
+magnetModule();

rack/print/magnetModule_P2.scad

@@ -0,0 +1,6 @@
+include <../side/magnetModule.scad>
+
+// Oriented for 3d printing.
+// Supports generally not required (? need to print to test)
+mirror(v=[1,0,0])
+magnetModule();

rack/print/mainRail_P.scad

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+include <../mainRail.scad>
+
+// Oriented for 3d printing.
+// Supports not required.
+multmatrix(mainRailPrintOrientation)
+mainRail();
+
+
+mainRailPrintOrientation = [
+    [cos(-90),  0, sin(-90), railTotalHeight],
+    [0,         1, 0,        0              ],
+    [-sin(-90), 0, cos(-90), 0              ],
+    [0,         0, 0,        1              ]
+  ];

rack/print/sideWallLeft_P.scad

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+include <../side/sideWallLeft.scad>
+
+// Oriented for 3d printing.
+// Supports generally not required (? need to print to test)
+sideWallLeft();

rack/print/sideWallRight_P.scad

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+include <../side/sideWallRight.scad>
+
+// Oriented for 3d printing.
+// Supports generally not required (? need to print to test)
+sideWallRight();

rack/print/xBar_P.scad

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+include <../xBar.scad>
+
+// Oriented for 3d printing.
+// Supports generally not required: depending on roundness.
+xBar();

rack/print/yBar_P.scad

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+include <../yBar.scad>
+
+// Oriented for 3d printing.
+// Supports required at XY wall connections, and depending on roundness
+yBar();