1.6.0

This change was implemented after getting feedback from OHSU. Some ADRCs do not have the optional forms like A2 or A3 in their REDCap project at all, since they will not be used for that center. NACCulator used to run with the requirement that all forms be present in a REDCap project, whether they were optional or not. This change is very similar to the one made previously that made the CLS, Z1, and C1 forms optional for the REDCap csv input.