The temperature range 0-100 was inadequate in both supported
scales (Celsius and Fahrenheit). Extend the range to encompass
all physically meaningful values in both scales.
Use the default-values to set the minimum and maximum of the
UI-fields. Thus, these values are configurable in a single place.
In the future we should use a scale-independent representation
(e.g. mkelvin as in the rest of the code base). But this would
mean implementing a custom widget with a conversion function.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
1470048773