This should fix issues with pull request 467, I hope.

Conflicts:
	Marlin/Configuration.h
	Marlin/Marlin.pde
	Marlin/ultralcd_implementation_hitachi_HD44780.h

Servo Enstops working!

Diffed and merged, preserving my updates

Integrated fixes from henrikbrixandersen pull request #504

faster GLCD (ST7920 SW-SPI) implementation / fixes

- fixed long menu entries (>14 or >18 chars) caused overrun in dogm lcd
implementation
- fixed pin set problem when in interrupt
- much faster ST7920 SW-SPI implementation
- increased ST7920 framebuffer size for more speed

Added support for Megatronics v2.0 and Minitronics v1.0

Fix: Long menu entries (>14 or >18 chars) caused overrun in hitachi display implementation

merged from code downloaded from reprapworld.com

Fixed typo in Comment

Revert previous change pin check change

Reviert previous change of #if BLAH_PIN > 0 to #if defined(BLAH_PIN) &&
BLAH_PIN > -1. Unfortunately some times pin 0 is used. For my sins I've
gone through and replaced all unsafe checks of #if BLAH_PIN > -1 with
the safe version.

fixed typo / added "const" to defines for newer gcc compatibility

Add Panelolu2 support for Melzi

fix broken LCD commit #dfa549f268 from buildrob - GLCD/DOGM implementati...

LCD: Added Deadzone at 100% Feedrate

Implement automatic cold-end/extruder motor fan control based on nozzle temperature

Combine and converge other I2C LCD branches (PANELOLU2, VIKI & PCF8575)

This adds a deadzone at 100% Feedrate when changing it at the status
screen/main menu. Prevents from unwanted feedrate-changing when
navigating back to the main menu and makes it easier to return to 100%.