[Building Sakai] Assignment+Gradebook integration: "Save" grade

[Branden Visser]

Hi everyone,

There is an anomaly in assignments where if you link an assignment to an 
existing gradebook ("bi-directional"), you can't "Save" a grade that has 
already been released.

Steps to reproduce:

1. create a gradebook entry
2. create an assignment
3. link the assignment to the gradebook entry
4. assign a student a grade and "Release" it
5. go back and change the student's grade, but "Save"

You'll see that the student grade will hold on the latest 'released' 
grade that comes from gradebook.

The problem seems to be that Assignments tries to "remove" the Gradebook 
grade through the integration API like unidirectional link does, but 
fails. I'm thinking that if the assignment is linked bi-directionally, a 
"Save" in assignments should update the gradebook entry so both 
assignments and gradebook will take the new value, as opposed to none of 
them.

I can provide a patch for this if this is the way we want to go.

What are your thoughts?

Thanks,
Branden