Add Z_AFTER_PROBING option

Some fix-mounted probes need manual stowing. And after probing some may prefer to raise or lower the nozzle. This restores an old option but tailors it to allow raise or lower as preferred.

Marlin/ubl_G29.cpp

@@ -387,6 +387,7 @@
           restore_ubl_active_state_and_leave();
         }
         do_blocking_move_to_xy(0.5 * (MESH_MAX_X - (MESH_MIN_X)), 0.5 * (MESH_MAX_Y - (MESH_MIN_Y)));
+        report_current_position();
       }
 
     #endif // HAS_BED_PROBE
@@ -424,6 +425,8 @@
             }
             probe_entire_mesh(g29_x_pos + X_PROBE_OFFSET_FROM_EXTRUDER, g29_y_pos + Y_PROBE_OFFSET_FROM_EXTRUDER,
                               parser.seen('T'), parser.seen('E'), parser.seen('U'));
+
+            report_current_position();
             break;
 
         #endif // HAS_BED_PROBE
@@ -471,6 +474,8 @@
 
             SERIAL_PROTOCOLLNPGM("G29 P2 finished.");
 
+            report_current_position();
+
           #else
 
             SERIAL_PROTOCOLLNPGM("?P2 is only available when an LCD is present.");
@@ -754,6 +759,8 @@
       } while (location.x_index >= 0 && --max_iterations);
 
       STOW_PROBE();
+      move_z_after_probing();
+
       restore_ubl_active_state_and_leave();
 
       do_blocking_move_to_xy(