Hide display of refill counter automatically if transferred value cannot be properly
transformed to numeric value or intentionally left unset (i. e. set to None if refill
is not applicable, e. g. for TopUp Operation)
Bugfix: change order of brick search path, i. e. put custom path in front of
system path to favor user-modified version over standard implementation.
Bugfix: handle incoming numeric values correctly for the ordinate axis
Merge pull request #3 from hellmig/bessy

Small changes/bugfixes