geometry changes/fixes/new features

new grid walkers + fixes
new test-cases
worked on step/and turn detection
android offline-data-reader
worked on vap-grouping

Assertions.h

@@ -3,6 +3,7 @@
 
 #include "Exception.h"
 #include <sstream>
+#include <cmath>
 
 // for GTEST Testcases
 #define FRIEND_TEST(test_case_name, test_name)\
@@ -66,9 +67,12 @@ namespace Assert {
 		if (std::abs(v1-v2) > delta) {doThrow(err);}
 	}
 
+
 	template <typename T, typename STR> static inline void isBetween(const T v, const T min, const T max, const STR err) {
-		std::stringstream ss; ss << "\n[" << min << ":" << max << "] but is " << v << "\n";
-		if (v < min || v > max) {doThrow(err+ss.str());}
+		if (v < min || v > max) {
+			std::stringstream ss; ss << "\n[" << min << ":" << max << "] but is " << v << "\n";
+			doThrow(err+ss.str());
+		}
 	}
 
 }