Merge branch 'cnf' into 'master'

fix for issue #5

See merge request !3

glueminisat/core/Solver.cc

@@ -1845,7 +1845,7 @@ void Solver::toDimacs(FILE* f, const vec<Lit>& assumps)
     }
     cnt += trail.size();
 
-    fprintf(f, "p cnf %d %d\n", max, cnt);
+    fprintf(f, "p cnf %d %d\n", max+1, cnt);
 
     for (int i = 0; i < assumptions.size(); i++){
         assert(value(assumptions[i]) != l_False);