yet another attempt to solve issues with the dotload tester. This code

yet another attempt to solve issues with the dotload tester. This code
was very complex, more than it should have ...
Reduce it to something simple:
  - parse the compute node
  - create transfer and control dependencies by browsing the input edges
    of the compute nodes
  - add extra dependencies from or to the 'root' and 'end' nodes for the
    entry and exit tasks respectively.
The hope is that the order in some output will stay consistent across
cdash distributions.