Misc changes; coalesce membership and registration tables,
remove eid field from persons, replace course semester field
with termSeason, termType, and termYear, associate campuses
with courses, and change person field gradeuid to student_sis_id.
Minor changes to allow for sections to be created without
associated courses. Also removed fatal exception when a
membership or section_membership refers to a
course/user/section that doesn't exist. The
membership/section_membership is now simply ignored.

Also added fields in Course and Membership to allow for
import of Jenzabar data and export to CRM.

MINI-26