Recursive solution for DagResolver, !tested, !stable, !finished
Dev-tested for moderately complex control case. No IO at all.
Devtest for resolver added (control only), code for io resolution added.
Dataflow is untested! Careful! Minor changes to XML structure and Dag DS
too.
Removed unused imports etc, added meager comments to help remember
Merge pull request #5 from Upsham/dev-ukd

Almost done with milestone... Code complete