add numerical recipes library

lib/nr/cpp/other/nrexit.cpp

@@ -0,0 +1,13 @@
+
+#include <iostream>
+using namespace std;
+
+// Function used to stall exit in Borland C++Builder
+
+void nrexit(void)
+{
+        cin.get();
+        return;
+}
+
+#pragma exit nrexit