Panel One encoder pins

Added support for PanelOne from T3P3.

Extend the idea of dummy temperature sensors.

Support for simple customisable AutoZProbing area

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

Latest upstream changes

Fix typos in checkExtruderAutoFans

Cleanup ramps boards

- Fix bug in lcd_control_temperature_menu
- Remove test menu-item left in from multi-line command feature
- Replace literals with translatable strings
- Reduce lcd_preheat code redundancy
- Reduce menu macro redundancy
- Clean up formatting

Fix implementation of PID menu items

Fix iss#1492

Last commit before bed.