Fixes issues # 216 and # 135 for Gen6 and Gen6 Deluxe board

Power signal control definitions for other power supplies

Added optional feature to stop printing when an endstop is hit. Made the Z display on the LCD in 3.2 format instead of 3.1. Added LCD message when and endstop is hit.

Definitions for Sanguino SPI

Small changes on the LCD panel, let the speed control work better, line up the parameter edit the same as the menu, remove some unused defines, and remove the Z from the 10mm move menu.

Automatically set *_MIN_PIN and *_MAX_PIN according to *_HOME_DIR.

fixed  (#328) pwm generation at pin D12 and D13

For boards with only one endstop per axis, automatically set *_MIN_PIN and *_MAX_PIN according to *_HOME_DIR.

fixed pwm generation at pin D12 and D13 when one of them is used as FAN_PIN on Sanguino, added soft pwm entry for FAN_PIN in temperature.cpp

Fix the russian translation.

Reverted the patch by KevinOConnor, as it crashes some versions of avr-gcc and caused linking issues.

Add additional optimization flags to Makefile

Use "whole program" and "link time optimization" features of gcc.  The
whole-program optimization enables the compiler to evaluate the entire
firmware for optimization instead of just one code file at a time.
This leads to better overall optimizations.

The "relax" option enables the linker to convert certain "call"
instructions to the smaller "rcall" instruction.  This reduces the
size of the resulting binary.