Conductivity tests pass now!

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>

dev/fluids/IsoButane.json

@@ -417,7 +417,7 @@
         "B": [
           1.0
         ], 
-        "T_reducing": 407.82, 
+        "T_reducing": 407.85, 
         "T_reducing_units": "K", 
         "m": [
           0
@@ -431,18 +431,18 @@
       }, 
       "residual": {
         "B": [
-          -0.0394953, 
-          0.161607, 
-          -0.138049, 
-          0.0483126, 
-          -0.00578452, 
-          0.0451967, 
-          -0.134395, 
-          0.115446, 
-          -0.0411718, 
-          0.00543111
+          -0.0411789, 
+          0.146805, 
+          -0.119190, 
+          0.0410226, 
+          -0.00488704, 
+          0.0476346, 
+          -0.128445, 
+          0.107565, 
+          -0.0385968, 
+          0.00520901
         ], 
-        "T_reducing": 407.82, 
+        "T_reducing": 407.85, 
         "T_reducing_units": "K", 
         "d": [
           1, 
@@ -456,7 +456,7 @@
           4, 
           5
         ], 
-        "rhomass_reducing": 225.5, 
+        "rhomass_reducing": 224.4, 
         "rhomass_reducing_units": "kg/m^3", 
         "t": [
           0, 

dev/fluids/SES36.json

@@ -277,7 +277,7 @@
     }
   ], 
   "NAME": "SES36", 
-  "REFPROP_NAME": "SES36", 
+  "REFPROP_NAME": "N/A", 
   "STATES": {
     "critical": {
       "T": 450.7,