Fix issue 935: error in matrix calculation
Corrected retract() call for use of auto probe without sled enabled.
Corrected #endif and ifdef for Z_PROBE_SLED code.
Added profile for RAMPS with 2 extruders and 1 fan.
	modified:   Marlin/Configuration.h
	modified:   Marlin/pins.h
Merge pull request #1051 from fsantini/EZ_fix935

Fix issue 935: error in matrix calculation
Added #ifndef DELTA wrapper to float delta
Added ifndef
Fix build for non-sled bed auto levelling

This function should only be used with sled, not all bed auto
levelling.
Merge pull request #1078 from brackendawson/Marlin_v1

Fix build for non-sled bed auto levelling
Merge pull request #1065 from oliasmage/Marlin_v1

Corrected retract() call for use of auto probe without sled enabled.
Update thermistortables.h

Add another thermistor table,use with hotend "Simple ONE" & "All in ONE"
Update configuration.h

Add another comment on configuration.h for the value of thermistor.
I make a pull request on thermistortables.h with my thermistor (12),but y see there is a comment on configuration with number 12 but it's not present on thermistortables.h ?

Thx
Update configuration.h

Add another comment for thermistor 13 ,use with Hotend "Simple ONE & All In ONE"
Update thermistortables.h

Add another thermistor table (13),it's a cartridge thermistor up to +300°C,use with Hotend "Simple ONE" & "All In ONE"

Thx
Update motion_control.cpp

G03 Full circle did not work (G02 is working correct)
Simple code cleanup. Rename "homeing" to homing.
Proposed feature: Set Home Offsets

Add an item to the LCD menu that applies the current axis position to
the “add_homeing” offset.
Adjust the Z display to hide float rounding errors
Make hotend optional when compiling with lcd support

Signed-off-by: Matthew Schick <matthew.schick@gmail.com>
Merge pull request #1098 from mattsch/optional_hotend_lcd

Make hotend optional when compiling with lcd support