Course Materials Module - Course Members

Course Materials Module - Course Members

- Add IDL Class and asset table to map actor.usr and
asset.course_module_course, along with an optional
string value for the user's role in the course. If
desired, this can later be fleshed out into a separate
course role table.

Signed-off-by: Kyle Huckins <khuckins@catalyte.io>
 Changes to be committed:
	modified:   Open-ILS/examples/fm_IDL.xml
	modified:   Open-ILS/src/sql/Pg/040.schema.asset.sql
	modified:   Open-ILS/src/sql/Pg/upgrade/XXXX.schema.course-materials-module.sql