Make schematics more clean.

Author: kaklik

hw/sch_pcb/BATDATUNIT01.kicad_prl

@@ -1,6 +1,6 @@
 {
   "board": {
-    "active_layer": 3,
+    "active_layer": 2,
     "active_layer_preset": "",
     "auto_track_width": true,
     "hidden_netclasses": [],
@@ -33,6 +33,7 @@
       "footprint_text",
       "footprint_anchors",
       "ratsnest",
+      "grid",
       "footprints_front",
       "footprints_back",
       "footprint_values",

hw/sch_pcb/BATDATUNIT01.kicad_pro

@@ -535,6 +535,7 @@
       "single_global_label": "ignore",
       "unannotated": "error",
       "unconnected_wire_endpoint": "warning",
+      "undefined_netclass": "error",
       "unit_value_mismatch": "error",
       "unresolved_variable": "error",
       "wire_dangling": "error"