Report changes from previous PR from old code base including :

I've updated the minimum values from the LCD.
It has been a while that i want to at least fix this.
I have an inductive probe and often i need to set my zOffset to something lower than 0.5.
With the current implementation, the default LCD value is set to 0.5 for some reason.
On my case i need to be able to set it down to 0.0 as my inductive probe can be lower than 0.5.
Before with the LCD we couldn't change this value below 0.5. We had to flash the firmware every time which was painful.
Now we are able to change this value down to 0.0 if needed.
I've also changed the minimum value for Z min acceleration.
In the default configuration it's set to 25 but on the LCD the minimum was 100 which is not coherent.
I've changes the minimum to 10. On this axis, depending on the mechanics/motor drivers we might require very low acceleration, so i guess 10 is somehow realistic.

Marlin/ultralcd.cpp

   START_MENU();
   MENU_ITEM(back, MSG_CONTROL, lcd_control_menu);
   #ifdef ENABLE_AUTO_BED_LEVELING
-    MENU_ITEM_EDIT(float32, MSG_ZPROBE_ZOFFSET, &zprobe_zoffset, 0.5, 50);
+    MENU_ITEM_EDIT(float32, MSG_ZPROBE_ZOFFSET, &zprobe_zoffset, 0.0, 50);
   #endif
-  MENU_ITEM_EDIT(float5, MSG_ACC, &acceleration, 500, 99000);
+  MENU_ITEM_EDIT(float5, MSG_ACC, &acceleration, 10, 99000);
   MENU_ITEM_EDIT(float3, MSG_VXY_JERK, &max_xy_jerk, 1, 990);
   MENU_ITEM_EDIT(float52, MSG_VZ_JERK, &max_z_jerk, 0.1, 990);
   MENU_ITEM_EDIT(float3, MSG_VE_JERK, &max_e_jerk, 1, 990);
   MENU_ITEM_EDIT(float3, MSG_VTRAV_MIN, &mintravelfeedrate, 0, 999);
   MENU_ITEM_EDIT_CALLBACK(long5, MSG_AMAX MSG_X, &max_acceleration_units_per_sq_second[X_AXIS], 100, 99000, reset_acceleration_rates);
   MENU_ITEM_EDIT_CALLBACK(long5, MSG_AMAX MSG_Y, &max_acceleration_units_per_sq_second[Y_AXIS], 100, 99000, reset_acceleration_rates);
-  MENU_ITEM_EDIT_CALLBACK(long5, MSG_AMAX MSG_Z, &max_acceleration_units_per_sq_second[Z_AXIS], 100, 99000, reset_acceleration_rates);
+  MENU_ITEM_EDIT_CALLBACK(long5, MSG_AMAX MSG_Z, &max_acceleration_units_per_sq_second[Z_AXIS], 10, 99000, reset_acceleration_rates);
   MENU_ITEM_EDIT_CALLBACK(long5, MSG_AMAX MSG_E, &max_acceleration_units_per_sq_second[E_AXIS], 100, 99000, reset_acceleration_rates);
   MENU_ITEM_EDIT(float5, MSG_A_RETRACT, &retract_acceleration, 100, 99000);
   MENU_ITEM_EDIT(float5, MSG_A_TRAVEL, &travel_acceleration, 100, 99000);