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.
Merge pull request #1051 from fsantini/EZ_fix935

Fix issue 935: error in matrix calculation
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.
merged latest upstream