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

sensors/radio/AccessPoint.h

@@ -10,26 +10,50 @@
  */
 class AccessPoint {
 
-public:
+private:
 
 	/** the AP's MAC-Address */
-	const MACAddress mac;
+	MACAddress mac;
 
-	/** the AP's readable SSID */
-	const std::string ssid;
+	/** OPTIONAL the AP's readable SSID */
+	std::string ssid;
 
 public:
 
-	/** ctor */
+	/** empty ctor */
+	AccessPoint() {
+		;
+	}
+
+	/** ctor with MAC and SSID */
 	AccessPoint(const MACAddress& mac, const std::string& ssid) : mac(mac), ssid(ssid) {
 		;
 	}
 
-	/** ctor */
+	/** ctor with MAC and SSID */
 	AccessPoint(const std::string& mac, const std::string& ssid) : mac(mac), ssid(ssid) {
 		;
 	}
 
+	/** ctor with MAC and without SSID */
+	AccessPoint(const MACAddress& mac) : mac(mac), ssid() {
+		;
+	}
+
+	/** ctor with MAC and without SSID */
+	AccessPoint(const std::string& mac) : mac(mac), ssid() {
+		;
+	}
+
+public:
+
+	/** get the AP's MAC address */
+	inline const MACAddress& getMAC() const {return mac;}
+
+	/** OPTIONAL: get the AP's ssid (if any) */
+	inline const std::string& getSSID() const {return ssid;}
+
+
 };
 
 #endif // ACCESSPOINT_H