Merge pull request #377 from wolfmanjm/upstreamedge

Only report long lines in config if not truncating a comment
Added G30 simple Z probe, will probe for Z at current XY and report how far the probe moved down
Merge pull request #380 from wolfmanjm/feature/z-probe

Added G30 simple Z probe, will probe for Z at current XY and report how ...
Add Z probe to M119
Change G30 to return to originalpostion after probe
G30 Znnn will stop probe on hit and set Z to nnn