Implemented and tested for both platforms. This is quite a big
commit. Unlike with the previous changes to now choosable PWM
frequencies, all board configuration files and Configtool had
to be changed immediately to deal with the additional parameter
in DEFINE_HEATER() and keep AVR builds working (and regression
tests passing).
The idea is to open the user's email client automatically, so
(s)he has not much more to do than to write a sentence about what
went wrong. As easy as possible!
This is work related to issue #159.
The Steinhart-Hart algorithm allows more precise thermistor
tables, but also requires more parameters, which aren't
available for all thermistors. Accordingly, add support for both,
the traditional logic using the beta parameter as well as the new
one.
This also adds thermistor-presets, so users can simply choose
from a pulldown-menu to set their thermistor.
Also, identical thermistors get merged into one table, saving
binary size.
Last not least, a few bugs in this area got fixed.
Usually, all these things go into separate commits, but they were
contributed all in one and separating them is a bit error-prone
for little gain.
This should address issue #130, #134 and #135.