[Energy IQ] Allow for new meter and continue entering meter readings
When replacing a meter, it becomes hard to continue entering meter readings as one has to add the last old meter reading to the new meter readings (and sometimes even subtract the first new meter reading from that number too).
Under Energy IQ, provide a meter reset button, with for the date of changeover:
++ the first new meter reading as its zero value, 0 by default.
++ the last old meter reading