Merge branch 'develop' of https://github.com/projectchrono/chrono into develop
Merge branch 'develop' of https://github.com/projectchrono/chrono into develop
adding velocity and force actuation modes to ChLinkLinActuator, the class for translational actuators
Merge branch 'develop' of https://github.com/jcmadsen/chrono into develop

Conflicts:
	src/core/ChFileutils.cpp
	src/core/ChFileutils.h