Moved randseed to former location, added randseed calls to ST_grid.c

Issue #256. Moving the randseed calls to before RunGrid() was resulting in different behavior with the same seed. To remedy this I have moved calls to randseed back to their former location, and added separate randseed calls in ST_grid.c in the equivalent location right after Plot_Initialize().

ST_grid.c

@@ -191,6 +191,12 @@ extern SW_SITE SW_Site;
 extern SW_VEGPROD SW_VegProd;
 extern SW_WEATHER SW_Weather;
 extern pcg32_random_t grid_rng; //this file's unique random number generator
+extern pcg32_random_t environs_rng;
+extern pcg32_random_t mortality_rng;
+extern pcg32_random_t resgroups_rng;
+extern pcg32_random_t species_rng;
+extern pcg32_random_t grid_rng;
+extern pcg32_random_t markov_rng;
 
 //This is Rgroup structure pointer that will read rgroup disturbance value, will be used in
 // grid disturbance
@@ -455,6 +461,14 @@ void runGrid(void)
 			parm_Initialize(iter);
 
 		Plot_Initialize();
+
+		RandSeed(Globals.randseed, &environs_rng);
+	RandSeed(Globals.randseed, &mortality_rng);
+	RandSeed(Globals.randseed, &resgroups_rng);
+	RandSeed(Globals.randseed, &species_rng);
+	RandSeed(Globals.randseed, &grid_rng);
+	RandSeed(Globals.randseed, &markov_rng);
+
 		if (iter > 1)
 			_free_grid_globals(); //frees the memory from when we called _load_grid_globals() last time... (doesn't need to be called on the first iteration because the memory hasn't been allocated yet)
 

ST_main.c

@@ -163,13 +163,6 @@ int main(int argc, char **argv) {
 
 	printf("STEPWAT  init_args() executed successfully \n");
 
-	RandSeed(Globals.randseed, &environs_rng);
-	RandSeed(Globals.randseed, &mortality_rng);
-	RandSeed(Globals.randseed, &resgroups_rng);
-	RandSeed(Globals.randseed, &species_rng);
-	RandSeed(Globals.randseed, &grid_rng);
-	RandSeed(Globals.randseed, &markov_rng);
-
 	if (UseGrid == TRUE) {
 		runGrid();
 		return 0;
@@ -208,6 +201,13 @@ int main(int argc, char **argv) {
 
 		Plot_Initialize();
 
+		RandSeed(Globals.randseed, &environs_rng);
+		RandSeed(Globals.randseed, &mortality_rng);
+		RandSeed(Globals.randseed, &resgroups_rng);
+		RandSeed(Globals.randseed, &species_rng);
+		RandSeed(Globals.randseed, &grid_rng);
+		RandSeed(Globals.randseed, &markov_rng);
+
 		Globals.currIter = iter;
 
 		if (storeAllIterations) {