Push circle clock synchronisation into circle.py

add workaround to circle _last_log_address out of sync
In logging self.mac => str(self.mac) otherwise sometimes we got a Python error
Simplify synchronisation of PowerUpdate and EnergyCounters by changing calling structure _update_energy_today_now
Simplify history collection and network occupation on PlugWise startup by calculating missing addresses and calling off one address per PowerUpdate loop
Calculate historal addresses based on know combination of address+timestamp+slot.
Only call off PowerUpdate if NodePing was successful.
Bump beta version

Author: dirixmjm

plugwise_usb/__init__.py

@@ -598,30 +598,20 @@ def _update_loop(self):
         """
         self._run_update_thread = True
         _discover_counter = 0
-        _sync_clock = False
-        day_of_month = datetime.now().day
         try:
             while self._run_update_thread:
-                if datetime.now().day != day_of_month:
-                    day_of_month = datetime.now().day
-                    _sync_clock = True
                 for mac, device in self._device_nodes.items():
                     if device:
                         if device.battery_powered:
                             # Check availability state of SED's
                             self._check_availability_of_seds(mac)
+                        elif device.measures_power:
+                            # Request current power usage of those that reply on ping
+                            device.do_ping(device.request_power_update)
                         else:
                             # Do ping request for all non SED's
                             device.do_ping()
 
-                        if device.measures_power:
-                            # Request current power usage
-                            device.request_power_update()
-                            # Sync internal clock of power measure nodes once a day
-                            if _sync_clock:
-                                device.sync_clock()
-                _sync_clock = False
-
                 # Do a single ping for undiscovered nodes once per 10 update cycles
                 if _discover_counter == 10:
                     for mac in self._nodes_not_discovered: