many changes and updates

- changed the wifi-estimation api
- adjusted test-cases
- worked on grid-bulding and grid-importance
- new walking modules
- fixed some minor issues

Assertions.h

@@ -2,6 +2,11 @@
 #define ASSERTIONS_H
 
 #include "Exception.h"
+#include <sstream>
+
+// for GTEST Testcases
+#define FRIEND_TEST(test_case_name, test_name)\
+friend class test_case_name##_##test_name##_Test
 
 /**
  * this file provides assertion methods that may be enabled to trace
@@ -62,7 +67,8 @@ namespace Assert {
 	}
 
 	template <typename T, typename STR> static inline void isBetween(const T v, const T min, const T max, const STR err) {
-		if (v < min || v > max) {doThrow(err);}
+		std::stringstream ss; ss << "\n[" << min << ":" << max << "] but is " << v << "\n";
+		if (v < min || v > max) {doThrow(err+ss.str());}
 	}
 
 }