changed tapwater detection mechanism:
- added EMS_BOILER.wWCurFlow to be read from 0x34 messages, this gives the current amount of tapwater flowing in dl/min
- added wWCurFlow to mqtt message
- added wWCurFlow to telnet statistics
changed detection from: selBurnPow and selFlowTemp to wWCurFlow
added the current servicecode as seen on thermostat and boieler display to telnet statistics and mqtt message