Toggle menu for PSU from LCD pannel

From the prepare menu, accessible when is not printing, you have the
possibility to turn off the PSU when is on et vice versa.
From the host, you can turn off or turn on the PSU then the menu is
updated accordingly.
From the LCD message, the printer status is reported ready or off
respectively when the PSU is on or off.
Turn off power supply off-load

Disable the high current output and wait a little before to turn off,
because the interrupting capacity of the PSU is unknown.
Could be a function if needed by other.
No bed config for RAMPS

The motherboard 35 is a config without bed with this pins setting :
D8 Extruder
D9 Fan
D10 Controller Fan
Merge branch 'Marlin_v1' of https://github.com/ErikZalm/Marlin.git into Marlin_v1

Conflicts:
	Marlin/Configuration.h
	Marlin/Marlin_main.cpp
	Marlin/language.h
	Marlin/pins.h
	Marlin/ultralcd.cpp
Added default configurations for deltas when DELTA is defined
update max pos
Support dual x-carriage printers

Dual x-carriage designs offer some substantial improvements for dual
extruder printing.
fix zjerk being the same for delta as xy jerk
add more delta defaults
on delta make second home even slower
enable soft endstops for delta
disable delta by default
Remove dual x-carriage functionality that could/should be implemented in slicer

Also added a couple of missed merge lines in homeaxis() from previous
commit.
Merge pull request #548 from buildrob101/MinimalDualXCarriage

Dual x-carriage support
Disable DUAL_X_CARRIAGE by default
Merge pull request #549 from buildrob101/MinimalDualXCarriage

Disable DUAL_X_CARRIAGE by default
Fixed compile error when QUICK_HOME is defined.

As well a couple of minor changes to handling of extruder offset for
dual x-carriage mode.
Merge pull request #550 from buildrob101/MinimalDualXCarriage

Fixed compile error when QUICK_HOME is defined.
Merge github.com:ErikZalm/Marlin into Marlin_v1

Conflicts:
	Marlin/language.h
Run Marlin/language.h through dos2unix
Update language.h so that all languages compile

Some strings still need translation, but at least everything compiles.
Uniformly reindent language.h
Only display poweron/poweroff if PS_ON_PIN > -1