set position in ctor that takes endpoints

and some cleanup
cleanup around how boundary shape is computed
fix misspelled slot
add velocity model for controlling avatar motion
Disable gravity on script start
repair addThrust() API so hydraMove.js works
sphere-cube: add the penetration don't subtract it
stop avatar integration when standing at rest
set the _lastFloorContactPoint
fix sphere-cube collisions, with tests
fix incorrect rescale of vec3
fix sphere-cube collisions at edges
whoops, committed wrong file.  Rolling back.
fix sphere-cube collisions at edges (really)
fix "nearly but not quite" edge/corner collisions
add CollisionList::deleteLastCollision()
forget collision for this failure case
commit implementation of deleteLastCollision()
reduce snagging when walking across voxel seams
remove debug #include <StreamUtils.h>