fix a bug in InteractionType with t-distribution

TO_DO

@@ -18,7 +18,7 @@ look for exported symbols that are not tagged with "eidos" or "Eidos" somewhere
 dump demangled symbols from SLiMgui:
 	nm -g -U -j ./SLiMgui | c++filt
 
-some valgrind commands (set SLIM_LEAK_CHECKING to 1):
+some valgrind commands (set SLIM_LEAK_CHECKING to 1, and change the compile C/C++ flags to -O1 -g):
 	valgrind --leak-check=yes --track-origins=yes --expensive-definedness-checks=yes --num-callers=20 ./slim -testEidos		(with Debug version)
 	valgrind --leak-check=yes --track-origins=yes --expensive-definedness-checks=yes --num-callers=20 ./slim -testSLiM		(with Debug version)
 	valgrind --tool=cachegrind ./slim -seed 1 /Users/bhaller/Desktop/MK_SLiMGUIsim4.txt		(with Release version)
@@ -79,7 +79,8 @@ reassuring the Clang analyzer that a precondition is met:
 	#endif
 
 count total lines of code in the project (excluding the gsl code):
-	( find ./core/ ./eidos/ ./eidostool/ ./EidosScribe ./SLiMgui '(' -name '*.mm' -or -name '*.h' -or -name '*.cpp' ')' -print0 | xargs -0 cat ) | wc -l
+	( find ./core/ ./eidos/ ./eidostool/ ./EidosScribe ./SLiMgui ./QtSLiM '(' -name '*.mm' -or -name '*.h' -or -name '*.cpp' ')' -print0 | xargs -0 cat ) | wc -l
+	( find ./core/ ./eidos/ '(' -name '*.mm' -or -name '*.h' -or -name '*.cpp' ')' -print0 | xargs -0 cat ) | wc -l
 	or better, use cloc (available in MacPorts); see https://stackoverflow.com/a/5121125/2752221
 
 a useful LaTeX equation editor:

core/interaction_type.cpp

@@ -5913,6 +5913,7 @@ EidosValue_SP InteractionType::ExecuteMethod_setInteractionFunction(EidosGlobalS
 	if_type_ = kernel.kernel_type_;
 	if_param1_ = kernel.kernel_param1_;
 	if_param2_ = kernel.kernel_param2_;
+	if_param3_ = kernel.kernel_param3_;
 	n_2param2sq_ = kernel.n_2param2sq_;
 
 	// mark that interaction types changed, so they get redisplayed in SLiMgui

core/spatial_kernel.h

@@ -72,7 +72,10 @@ class SpatialKernel
 
 	// calculate t-distribution PDF values in our fashion, for which the function is normalized to a maximum value
 	// we don't use the GSL for this, because it does two gamma-function calculations that we don't need (they normalize away)
-	static inline double tdist(double x, double max, double nu, double tau) { double x_over_tau = x / tau; return max / pow(1.0 + x_over_tau * x_over_tau / nu, -(nu + 1.0) / 2.0); };
+	static inline double tdist(double x, double max, double nu, double tau) {
+		double x_over_tau = x / tau;
+		return max / pow(1.0 + x_over_tau * x_over_tau / nu, -(nu + 1.0) / 2.0);
+	};
 
 public:
 	SpatialKernel(const SpatialKernel&) = delete;							// no copying