Guardian Module Fixes

- eliminate duplicate internal IDs to make Guardian PD Size 4 and
  Guardian MRP 2E available
- fix Frontier ID ('edID') for all guardian modules
- fix prices for all guardian modules
- add missing Frontier internal names ('symbol')

modules/standard/power_plant.json

@@ -492,7 +492,7 @@
     },
     {
       "class": 2,
-      "cost": 187360,
+      "cost": 192165,
       "edID": 128833988,
       "eddbID": 895,
       "eff": 0.5,
@@ -507,7 +507,7 @@
     },
     {
       "class": 3,
-      "cost": 468401,
+      "cost": 576493,
       "edID": 128833989,
       "eddbID": 895,
       "eff": 0.5,
@@ -522,7 +522,7 @@
     },
     {
       "class": 4,
-      "cost": 1686243,
+      "cost": 1729480,
       "edID": 128833990,
       "eddbID": 895,
       "eff": 0.5,
@@ -537,7 +537,7 @@
     },
     {
       "class": 5,
-      "cost": 5058729,
+      "cost": 5188441,
       "edID": 128833991,
       "eddbID": 895,
       "eff": 0.5,
@@ -552,7 +552,7 @@
     },
     {
       "class": 6,
-      "cost": 15176184,
+      "cost": 15565317,
       "edID": 128833992,
       "eddbID": 895,
       "eff": 0.5,
@@ -567,7 +567,7 @@
     },
     {
       "class": 7,
-      "cost": 45528551,
+      "cost": 46695951,
       "edID": 128833993,
       "eddbID": 895,
       "eff": 0.5,
@@ -582,7 +582,7 @@
     },
     {
       "class": 8,
-      "cost": 136585652,
+      "cost": 140087850,
       "edID": 128833994,
       "eddbID": 895,
       "eff": 0.5,
@@ -596,4 +596,4 @@
       "symbol": "Int_GuardianPowerplant_Size8"
     }
   ]
-}
+}