Instead of exposing FirstTime directly, expose a reset function

In preparation for rebasing this PR onto #4

This is a backward-incompatible change that will break earlier versions of LRSLib.jl.

Author: bzinberg

lrsnashlib.c

@@ -1118,7 +1118,7 @@ void updateFwidth(game *g, int col, int pos, char *str) {
                 ((gInfo *)g->aux)->fwidth[col][pos] = len;
 }
 
-// Definition of extern variable declared in the .h
-long FirstTime;
+static long FirstTime;
+void resetNashSolver() { FirstTime = TRUE; }
 
 /******************** end of lrsnashlib.c ***************************/

lrsnashlib.h

@@ -65,9 +65,9 @@ void printGame(game * g);
 void setFwidth(game *g, int len);
 void initFwidth(game *g);
 void updateFwidth(game *g, int col, int pos, char *str);
+void resetNashSolver();  /* Call this function for every new game to be solved */
 
 
-extern long FirstTime;   /* set this to true for every new game to be solved */
 static long Debug_flag;
 static long Verbose_flag;