Update solver to fix flow bug, add SFC

Update readme too.
KSP-RO · Jul 4, 2015 · 3244185 · 3244185
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diff --git a/RealFuels/Readme_RF.txt b/RealFuels/Readme_RF.txt
@@ -49,6 +49,10 @@ AN OVERVIEW OF FUEL TYPES AND TANK TYPES AND TECH LEVELS/ENGINE TYPES AND UPGRAD
 
 ==========
 Changelog:
+v10.4.3
+* Fix an NRE in ullage code in editor.
+* Fix a bug with multFlow not being used correctly.
+
 v10.4.2
 * Repack to include correct KSPAPIExtensions
 

diff --git a/Source/Engines/SolverRF.cs b/Source/Engines/SolverRF.cs
@@ -166,15 +166,16 @@ public override void CalculatePerformance(double airRatio, double commandedThrot
                 fxPower = (float)(fuelFlow / maxFlow * ispMult); // FX is proportional to fuel flow and Isp mult.
                 if (float.IsNaN(fxPower))
                     fxPower = 0f;
-
-                double exhaustVelocity = Isp * 9.80665d;
 
                 // apply fuel flow multiplier
                 double ffMult = fuelFlow * fuelFlowMult;
                 if (multFlow) // do we apply the flow multiplier to fuel flow or thrust?
                     fuelFlow = ffMult;
                 else
                     Isp *= fuelFlowMult;
+
+                double exhaustVelocity = Isp * 9.80665d;
+                SFC = 3600d / Isp;
 
                 thrust = ffMult * exhaustVelocity; // either way, thrust is base * mult * EV