[tracking] Implement whatever is needed for General Graduation Requirements support

[hawkrives]

http://catalog.stolaf.edu/curriculum/graduate-requirements-degrees/general-graduation-requirements-ba/

something like this:

Courses: 
  result: 35 credits from courses

Residency: 
  result: 17 credits from courses where {institution = STO}

Interim: 
  result: 3 credits from courses where {semester = Interim}

Grade Point Average: 
  result: at least GPA of 2.0 from courses where {graded = yes}

Course Level: 
  result: 18 credits from courses where {level >= 200}

Graded Courses: 
  result: 24 credits from courses where {institution = STO & graded = yes}
  # at most 6 of 35 credits from courses where {su = yes} & # this is another requirement
  # also need to adjust the GE requirements to exclude 1.0/0.5-credit, SU courses

Major: 
  result: >
    1 major from student &
    all majors from student with { {dept_code} => 21 credits from courses where { department != *dept_code } }

result: Courses & Residency & Interim & Grade Point Average & Course Level & Graded Courses & Major

this will need:

• to store the institution on the evaluatable course object (henceforce ECO)
• to store the grade type on the ECO (graded, pn, su, etc)
• … and more

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potential thing I was looking at here: the with block, where you can pass a little lambda function to run stuff over $things.

like here:

all majors from student with { {dept_code} => 21 credits from courses where { department != *dept_code } }

which would … somehow … bind each major to the lambda, then pull out the part of the major requested (name, catalog_year, type, dept_code), then run the contents of the block?