Added method for computing step form.  Factored with prologue code.
Added method for computing step form.  Factored with prologue code.

vtomole/SICL,vtomole/SICL,clasp-developers/SICL,clasp-developers/SICL,clasp-developers/SICL,vtomole/SICL,vtomole/SICL,clasp-developers/SICL