Config skim

Just removed from the config files the registers we don't modify during configuration

attic/2400001_test_lpgbtv1_vtrx1_2_long.json

 {
     "Optoboard":
     {
-        "serial": "00000000",
+        "serial": "2400001",
         "flx_G": 0,
         "flx_d": 0,
         "vtrx_v": "1.2"