fitcontinuous workstep processing seems to be integrated correctly in a
workflow!  The tree is written out and the alpha, aic, aicc results are
returned as the filter output spec table.
Added Data Integrator to Geiger algorithms supported for workflows.
DataIntegrator outputs modified tree successfully, but not the character
matrix yet.  Named ports aren't supported on worksteps, but otherwise
the engine is operational now.  Filters can write a tree or matrix and
have a return.  Maybe this is the way around no named ports for now...
write out both tree and matrix directly during filter processing..