export: remove unused lines
attributes: fixes in excel sheet

Fixed the following battery/bmv related dataAttributes (they always
returned 0):
-	Battery temperature
-	Deepest discharge
-	Last discharge
-	Average discharge
-	Total Ah Drawn

Added writeable register for the Hub4 setpoint

Known issue: solarcharger todays and yesterdays yield and maxpower do
not work.
Reason: on the D-Bus these are now arrays, and dbus_modbustcp does not support
that yet.
v0.6.3