…solver iterations; also replacing aeration tank on bsm2-p instead of cstr_injection with flowsheet level vars and constraints

…eys; revisit this change

… BSM2-P solver iterations; also replacing aeration tank on bsm2-p instead of cstr_injection with flowsheet level vars and constraints"

This reverts commit bd2caa8.

…ing files; fix issue related to session dbs file deletion on exit

…credentials used; bring tests back

… to troubleshoot errors after switch to sequential test deployment

…hange would break them again to identify what the solution was

…d bring back a change that I ultimately want to remove but think might have been part of prob

…erted for oliapi_instance, along with point to last session dbs file in test_flash; now will set refresh=True on oliapi_instance in conftest

…sponse when shifting to alternate version of OLI used for NAWI