Add a ported example configuration for the Velleman K8400 (Vertex) printer.

Supports both dual and single head printers (with the correct config).
Includes community sourced feed rate fix.

Rename / move files.

Remove redundant definitions.

Marlin/pins_K8400.h

@@ -0,0 +1,52 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/**
+ * Velleman K8400 (Vertex)
+ * 3DRAG clone
+ *
+ * K8400 has some minor differences over a normal 3Drag:
+ *  - No X/Y max endstops
+ *  - Second extruder step pin has moved
+ *  - No power supply control
+ *  - Second heater has moved pin
+ */
+
+#define BOARD_NAME              "K8400"
+#define DEFAULT_MACHINE_NAME    "Vertex"
+#define DEFAULT_SOURCE_CODE_URL "https://github.com/birkett/Vertex-K8400-Firmware"
+
+#include "pins_3DRAG.h"
+
+#undef  X_MAX_PIN
+#define X_MAX_PIN     -1
+#undef  Y_MAX_PIN
+#define Y_MAX_PIN     -1
+
+#undef E1_STEP_PIN
+#define E1_STEP_PIN   32
+
+#undef PS_ON_PIN
+#undef KILL_PIN
+
+#undef HEATER_1_PIN
+#define HEATER_1_PIN  11