Now we can create an axis that's topToBottom, BottomToTop, LeftToRight and
RightToLeft.
This was needed for the Temperature Plot, because it should be inverted
(starting on the bottom).
Signed-off-by: Tomaz Canabrava <tcanabrava@kde.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>