New feature branch MADE-workers

[Tim Penhey]

Hi all,

Since we are holding back the machine-dep-engine feature branch from
master until the first 2.0 alpha, we needed a place to merge in the
worker changes without impacting the blessedness of the
machine-dep-engine branch.

This feature branch should just hold the related manifold worker changes
over and above the machine-dep-engine changes.

Tim