Defines for electronics boards

Added boards.h which contains defines for all the board numbers, plus
some shorthand macros for less typing.

Split up languages.h. Use ISO language codes.

Added boards.h which contains defines for all the board numbers, plus
some shorthand macros for less typing.

Added example configs for printers from http://tvrrug.org.uk/

Breaking up languages.h makes it easier to translate. Using language
codes makes it easier to select a language and sets the naming standard.

Shrink and Optimize

A few constants where they belong

Wrap call to flush_presort

LCD Long Filename

Conflicts:
	Marlin/cardreader.h

adding hardware files for OMC

for ide 1.0.6

Support for Gen3 Monolithic electronics

Add Arduino add-ons for Arduino 1.5

Activate LiquidTWI2 device detection and space-pad LCD status line.

LCD "Abort" Message

Proposing adding gen7-dist from gen7 electronics repo - marlin now compiles for gen7

Negative values in menu

Display filament sensor data on a 20x4 LCD or Graphical LCD

Adding Melzi board

SD Sort and Buffer

For legacy boards it’s better if this option is disabled.

For the MORE_RAM option we need to buffer both the short and long
names, even though long names are sometimes redundant. Worst case, all
the names are max length. We can save some RAM by not storing these. We
could save more RAM by only storing the visible part of the long name.

With this option, always keeps the dir in RAM, doubling as a cache for
getfilename. A board with only 8K of SRAM is cutting it very close.

First iteration of alphabetical sorting for SD cards, both
slow+efficient and fast+rammy. Option for folders to sort first, last,
or not at all.

For the MORE_RAM option we need to buffer both the short and long
names, even though long names are sometimes redundant. Worst case, all
the names are max length. We can save some RAM by not storing these. We
could save more RAM by only storing the visible part of the long name.

With this option, always keeps the dir in RAM, doubling as a cache for
getfilename. A board with only 8K of SRAM is cutting it very close.