Fix problem with rcg.load() and add_contact()

.../scripts/sellar_problem/(X)DSM/MDAO_unconverged-DOE-J.pdf

...scripts/sellar_problem/(X)DSM/MDAO_unconverged-MDA-GS.pdf

...es/scripts/sellar_problem/(X)DSM/Mdao_converged-DOE-J.pdf

...scripts/sellar_problem/(X)DSM/Mdao_unconverged-DOE-GS.pdf

.../scripts/sellar_problem/(X)DSM/Mdao_unconverged-MDA-J.pdf

...scripts/sellar_problem/(X)DSM/Mdao_unconverged-OPT-GS.pdf

.../scripts/sellar_problem/(X)DSM/Mdao_unconverged-OPT-J.pdf

examples/scripts/sellar_problem/(X)DSM/RCG.pdf

examples/scripts/sellar_problem/(X)DSM/RCG.tex

examples/scripts/sellar_problem/CMDOWS/FPG_IDF.xml

examples/scripts/sellar_problem/CMDOWS/FPG_MDF-GS.xml

examples/scripts/sellar_problem/CMDOWS/FPG_MDF-J.xml

...es/scripts/sellar_problem/CMDOWS/FPG_converged-DOE-GS.xml

...les/scripts/sellar_problem/CMDOWS/FPG_converged-DOE-J.xml

...es/scripts/sellar_problem/CMDOWS/FPG_converged-MDA-GS.xml

...les/scripts/sellar_problem/CMDOWS/FPG_converged-MDA-J.xml

.../scripts/sellar_problem/CMDOWS/FPG_unconverged-DOE-GS.xml

...s/scripts/sellar_problem/CMDOWS/FPG_unconverged-DOE-J.xml

.../scripts/sellar_problem/CMDOWS/FPG_unconverged-MDA-GS.xml

...s/scripts/sellar_problem/CMDOWS/FPG_unconverged-MDA-J.xml