huge commit

- worked on about everything
- grid walker using plugable modules
- wifi models
- new distributions
- worked on geometric data-structures
- added typesafe timestamps
- worked on grid-building
- added sensor-classes
- added sensor analysis (step-detection, turn-detection)
- offline data reader
- many test-cases

geo/BBox3.h

@@ -37,6 +37,12 @@ public:
 
 	}
 
+	/** add the given bounding-box to this one */
+	void add(const BBox3& bb) {
+		add(bb.getMin());
+		add(bb.getMax());
+	}
+
 	/** get the bbox's minimum */
 	const Point3& getMin() const {return p1;}