new file:   generate_test_list_steppo.sh
new file:   generate_test_list_stepvan.sh
new file:   run_steppo.sh
new file:   run_stepvan.sh
new file:   runsStepPo/.gitignore
new file:   runsStepVan/.gitignore
Test scripts for backwards facing step problems

modified:   step_po.cc
modified:   step_van.cc
Modified to Backward Step problems