RepRapFirmware 1.19

This release supports auto bed levelling using multiple leadscrews, resume after power fail, SCARA kinematics support, and many other new features too numerous to list here.

IMPORTANT! Before upgrading to this release, read the important upgrade notes in the WHATS_NEW file (https://github.com/dc42/RepRapFirmware/blob/dev/WHATS_NEW.md) . You will also find the list of all the new features and bug fixes in the same place.