More misc UBL fixes and update gMax examples (#6632)

I think I forgot to Sync before I committed last time.   Some UBL
changes did not stick.

Also, update the gMax configuaration.h file so other than unique numbers
and settings, it exactly matches the default configuration.h file.

Marlin/example_configurations/gCreate_gMax1.5+/Configuration.h

 #define DEFAULT_ZJERK                  1.0
 #define DEFAULT_EJERK                  4.0
 
+//===========================================================================
+//============================= Z Probe Options =============================
+//===========================================================================
+// @section probes
+
+//
+// See http://marlinfw.org/configuration/probes.html
+//
+
+
+/**
+ * Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN
+ *
+ * Enable this option for a probe connected to the Z Min endstop pin.
+ */
+#define Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN
+
 
 /**
- * ===========================================================================
- * ============================= Z Probe Options =============================
- * ===========================================================================
- * @section probes
+ * Z_MIN_PROBE_ENDSTOP
+ *
+ * Enable this option for a probe connected to any pin except Z-Min.
+ * (By default Marlin assumes the Z-Max endstop pin.)
+ * To use a custom Z Probe pin, set Z_MIN_PROBE_PIN below.
+ *
+ *  - The simplest option is to use a free endstop connector.
+ *  - Use 5V for powered (usually inductive) sensors.
+ *
+ *  - RAMPS 1.3/1.4 boards may use the 5V, GND, and Aux4->D32 pin:
+ *    - For simple switches connect...
+ *      - normally-closed switches to GND and D32.
+ *      - normally-open switches to 5V and D32.
  *
+ * WARNING: Setting the wrong pin may have unexpected and potentially
+ * disastrous consequences. Use with caution and do your homework.
  *
+ */
+//#define Z_MIN_PROBE_ENDSTOP
+//#define Z_MIN_PROBE_PIN Z_MAX_PIN
+
+/**
  *   Probe Type
- *   Probes are sensors/switches that are activated / deactivated before/after use.
  *
  *   Allen Key Probes, Servo Probes, Z-Sled Probes, FIX_MOUNTED_PROBE, etc.
  *   You must activate one of these to use Auto Bed Leveling below.
- *
- *   Use M851 to set the Z probe vertical offset from the nozzle. Store with M500.
  */
 
 /**

Marlin/ubl.cpp

 
   void unified_bed_leveling::display_map(const int map_type) {
     const bool map0 = map_type == 0;
-    const uint8_t spaces = 9;
+    const uint8_t spaces = 11;
 
     if (map0) {
       SERIAL_PROTOCOLLNPGM("\nBed Topography Report:\n");
       serial_echo_xy(GRID_MAX_POINTS_X - 1, GRID_MAX_POINTS_Y - 1);
       SERIAL_EOL;
       serial_echo_xy(UBL_MESH_MIN_X, UBL_MESH_MAX_Y);
-      SERIAL_ECHO_SP(spaces * (GRID_MAX_POINTS_X - 2));
+      SERIAL_ECHO_SP(spaces * (GRID_MAX_POINTS_X - 2)-3);
       serial_echo_xy(UBL_MESH_MAX_X, UBL_MESH_MAX_Y);
       SERIAL_EOL;
     }
 
     if (map0) {
       serial_echo_xy(UBL_MESH_MIN_X, UBL_MESH_MIN_Y);
-      SERIAL_ECHO_SP(spaces * (GRID_MAX_POINTS_X - 2) + 4);
+      SERIAL_ECHO_SP(spaces * (GRID_MAX_POINTS_X - 2) + 1);
       serial_echo_xy(UBL_MESH_MAX_X, UBL_MESH_MIN_Y);
       SERIAL_EOL;
       serial_echo_xy(0, 0);

Marlin/ubl_motion.cpp

     const float e_normalized_dist = e_position / on_axis_distance,
                 z_normalized_dist = z_position / on_axis_distance;
 
-    int current_xi = cell_start_xi, current_yi = cell_start_yi;
+    int current_xi = cell_start_xi, 
+        current_yi = cell_start_yi;
 
     const float m = dy / dx,
                 c = start[Y_AXIS] - m * start[X_AXIS];