Updated Courses Pages

Changed the pages around to the following:

Courses/Index -> lists active courses for the term (excludes cross listed courses)
Courses/Details -> details about the course itself (with links to section details)
Courses/SectionDetails -> details about a section (evals, instructors, students)

Courses/CrossList -> Setup for cross listing courses

TODO: I need someone to take a look at the course listing post and need to figure out what/how to copy to the new course's sections.  This can be merged and setup as a "step" later.

The other thing to consider, which might be nicer (for cross-listed courses) you can't assign it as a child if it's in the system at all.  Meaning it can only be a fresh course from banner.  If it's imported, we may have to look at ways of deleting courses.