Allows the user to select wheter or not the PSU should be turned on or
kept in standby when marlin boots

Hopefully fixed viky button handling without braking other boards

- Added "Z_RAISE_BEFORE_HOMING" for raising Z the defined distance
before homing. This is useful to avoid Z-Probe collision when hotend is
near bed.

- Fixed the issue of Z not going bellow Z_PROBE_OFFSET when
"min_software_endstops" is true.
Now the Z_PROBE_OFFSET is not set in Z_MIN_POS, it is added after
homing.

Check the Readme for instruction how to enable and configure the feature

Include CPU Sethi 3D

Changed EEPROM CHITCHAT behavior. M503 is always enabled.

disable delta by default

add more delta defaults
on delta make second home even slower

M109 S180 waits only when heating.
M109 R180 also waits when cooling.

Reverse 'Bed' and 'Fan' at the RAMPS 33 Description.

Signed-off-by: Christian Inci <chris.pcguy.inci@gmail.com>

(Thanks iquizzle)

Diffed and merged, preserving my updates

merged from code downloaded from reprapworld.com

- changed the variables from keypad to reprapworld_keypad
- added a missing ifdef check

If S is left out perhaps it should be silent, but check the spec for
this M code.

Also cosmetic comment changes and spelling corrections in printed
messages