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
Report temperatures for all extruders
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
Only clamp panel movements if software endstops are enabled
Fix for ugly code compilation errors in SERVO_ENDSTOP checks
Merge pull request #532 from codexmas/ServoEndstops

Fix for ugly code compilation errors in SERVO_ENDSTOP checks
Should fix compiler warning for feedrate deadzone
Merge pull request #534 from xifle/Marlin_v1

Fixes compiler warning for feedrate deadzone
Update language.h

I update the spanish Messages, now this compile for spanish language.
added MaKr3d Melzi board
added contrast control function for gLCDs
Merge pull request #535 from GabinoLopez/patch-1

Update language.h
no message
fixed missing #endif
Merge branch 'Marlin_v1' of https://github.com/makr3d/Marlin into makr3d-Marlin_v1
restored configuration.h defaults
Merge pull request #531 from iXce/Marlin_v1_lcd

Only clamp panel movements if software endstops are enabled
M109 and M190 now wait when cooling down if R is used instead of S.
M109 S180 waits only when heating.
M109 R180 also waits when cooling.