Fix probe height at G28 start

Latest upstream commits

Finish pin tests

fix feedrate for homing z

Latest upstream commits

Z_PROBE_ENDSTOP

Incorporating Build Numbers

Latest upstream commits

Fix typo in Marlin_main.cpp

max_feedrate is in mm/s. line_to_destination needs a feedrate in mm/min because there is feedrate/60.

Refer to http://git-scm.com/docs/gitignore
to see why this is appropriate

The automatic versioning system extracts a
build version number from the SCM system

That versioning information is written to the file
_Version.h, a file that is NOT preserved in the SCM.

If such a file will be present,
we include it here to utilize the parameters
that are defined therein.

related to current_position[Z_AXIS] and retract_zlift.

'+ =' -> '+='

Fix for #1786

- Add comments documenting `thermal_runaway_protection`
- Add an enum for the thermal runaway states
- Add macros for temperature helper functions
- Fix a glitch with the z probe sled in homeaxis

Catch unlikely but possible error and head crash when using
Z_PROBE_REPEATABILITY_TEST

Fix MIN&MAX temperatures again

old bump_divisor for cartesian/corexy-printer

* Use "G29 S3 Xn Yn Zn.nn" to modify bad probed point manually
* Changed manual Z steps from 0.05 to 0.025 and made brought it to Configuration.h

is not used.

some people are starting to ask why homing is so slow. this is the old standard hard-coded value.

Conflicts:
	Marlin/Marlin_main.cpp