The X_Axis could not home to min while Y_Max endstop was trigged.

Cleanup of cardreader.*

- Apply standards to cardreader.*
- Fix minor issues with cardreader.cpp
- Apply standards to some other stale regions

Cleanup of temperature code

Fix undefined *_PROBE_BED_POSITION error

Panel One encoder pins

- Both TMC, L6470 and pin-driven drivers work.
- All can be mixed and matched as needed.

Merge upstream changes

Added support for PanelOne from T3P3.

Extend the idea of dummy temperature sensors.

Support for simple customisable AutoZProbing area

- Reduce calls to millis()
- General cleanup of manage_heaters
- General cleanup of pid autotune
- Formatting here & there
- Macros to clean up and shrink ISR code (reduced by ~364 lines)

Added a second sensor and made them configurable.

Cleanup and fix ultralcd.cpp

Latest upstream changes

Corrected a typo in ArduinoAddons/Arduino_1.5.x/(...)/boards.txt

Am I the only one who always need to change the thermistortable.h to add
a dummy table??
Ok, it is done. Just set the thermistor to 999 and it will always read
25C. Great for Testing or Development purposes.

Encoder multiplier - revised code