Added PDF file containing Menu Tree for documentation purposes.  

Update Marlin/pins.h

Long filename support for LCD display

Implemented support for KILL_PIN / Fixed compilation errors for incomplete/bad translations

PLEASE BE MORE CAREFUL WHEN SUBMITTING NEW TRANSLATIONS

When you add new menu items / messages always copy them to ALL
languages (just use english)

The cli(); at the start of the kill() function also stops the internal
arduino timer which stops updating of millis() which prevents the
display of the "KILLED." message.
The new function updates the display directly without checking any
timers.

Added new function to the LCD menu.  Preheat settings now adjustable and can be stored

Added Menu Options to the Main-> Control->Temperature Submenu that allow the user to set new values for the ABS and PLA preheat function.  EEPROM updated so that these settings can also be committed to EEPROM memory.

- related bug reports: Issue #201, Issue #213

- removed several multiple definitions of same message
- fixed definition of missing messages in german and spanish
- tweaked german translation (a lot)
- added note about changing and testing this file

Fixed broken Language file and pre-heat ABS and PLA options

Fixes error introduced at commit aee475aa which caused the sketch not to comile for language option 1.  Several defines were removed but still referenced in ultralcd.pde

The pre-heat ABS and PLA options in the LCD Menu were broken a while back.  The pre-heat worked fine, but the cooling fans were not switching on as intended.  This is now fixed.

Spanish language included in the language.h file

Spanish language included. It features the LCD screen messages and a small part of the Serial messages.

Updated german translations in language.h

Added support for dual Z axis stepper drivers

Add Duty Cycling to the Heater Bed

M206 fixes, and ancillary improvements

Really, we should have a way to adjust the XYZ homing of a machine in
the eeprom.  So as the second stage of this, make the M206 home offset
parameters subject to the M500/M501/M502/M503 eeprom commands.

Bump the eeprom version to "V06".

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

Replace the large macro HOMEAXIS with a function.  This avoids the
compiler generating three copies of largely identical code.  The
saving is 724 bytes of program memory.

We make use of XYZ_CONSTS_FROM_CONFIG to provide convenient
array-shaped access to MAX_LENGTH, HOME_RETRACT_MM and HOME_DIR.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>