added option to use throwing assert or real assert

src/throw_assert.h

 
 
 #ifndef throw_asssert
+
+#ifdef use_throwing_assert
 #define throw_assert(a) { if(!(a)) throw std::invalid_argument(#a); } 
+#else
+#include <assert.h>
+#define throw_assert(a) { assert(a); } 
 #endif