Fixed some MSVC conversion warnings and moved method-local inclusion of pme.h...

Fixed some MSVC conversion warnings and moved method-local inclusion of pme.h up to start of LJ file -- it wouldn't compile when included locally due to attempt to match extern binding with anonymous struct type.

platforms/reference/src/ReferenceKernels.cpp

@@ -399,9 +399,9 @@ void ReferenceCalcNonbondedForceKernel::initialize(const System& system, const N
         RealOpenMM my = periodicBoxSize[1]/nonbondedCutoff;
         RealOpenMM mz = periodicBoxSize[2]/nonbondedCutoff;
         RealOpenMM pi = (RealOpenMM) 3.1415926535897932385;
-        kmax[0] = std::ceil(-(mx/pi)*std::log(ewaldErrorTol));
-        kmax[1] = std::ceil(-(my/pi)*std::log(ewaldErrorTol));
-        kmax[2] = std::ceil(-(mz/pi)*std::log(ewaldErrorTol));
+        kmax[0] = (int)std::ceil(-(mx/pi)*std::log(ewaldErrorTol));
+        kmax[1] = (int)std::ceil(-(my/pi)*std::log(ewaldErrorTol));
+        kmax[2] = (int)std::ceil(-(mz/pi)*std::log(ewaldErrorTol));
         if (kmax[0]%2 == 0)
             kmax[0]++;
         if (kmax[1]%2 == 0)

platforms/reference/src/SimTKReference/ReferenceLJCoulombIxn.cpp

@@ -32,6 +32,8 @@
 #include "ReferenceLJCoulombIxn.h"
 #include "ReferenceForce.h"
 
+#include "pme.h"
+
 // In case we're using some primitive version of Visual Studio this will
 // make sure that erf() and erfc() are defined.
 #include "MSVC_erfc.h"
@@ -452,8 +454,7 @@ int ReferenceLJCoulombIxn::calculatePMEIxn( int numberOfAtoms, RealOpenMM** atom
                                              RealOpenMM* fixedParameters, RealOpenMM** forces,
                                              RealOpenMM* energyByAtom, RealOpenMM* totalEnergy) const {
 
-    #include "../SimTKUtilities/RealTypeSimTk.h"
-    #include "pme.h"
+
 
     RealOpenMM SQRT_PI = sqrt(PI);
     static const RealOpenMM one         =  1.0;