fixed some potential issues with MAC addresses

added corresponding test-cases
switched to newer version of tinyxml due to some issues
adjusted affected code-parts accordingly
for better re-use, moved ceiling-calculation to a new class
some minor fixes
new helper methods
worked on wifi-opt

main.cpp

@@ -29,7 +29,7 @@ int main(int argc, char** argv) {
     //::testing::GTEST_FLAG(filter) = "*WiFiOptimizer*";
 
 
-    ::testing::GTEST_FLAG(filter) = "*NormalN*";
+	::testing::GTEST_FLAG(filter) = "*FloorplanCeilings*";
     //::testing::GTEST_FLAG(filter) = "*Barometer*";
 	//::testing::GTEST_FLAG(filter) = "*GridWalk2RelPressure*";