RFC: Change rules for adding/changing test cases

[Robert Dewar]

<<Hmmm...  I don't know how to integrate that into my proposal.  Still,
when appropriate, comments in test cases about how previously found
bugs were fixed would be helpful, especially backend/frontend bugs (vs
bugs in common code).
>>

I definitely agree with the last point. What we do in the GNAT project is
to assign a tracking number to every problem report. The test case is filed
under this tracking number, and all revision history entries (which are 
always detailed, and include how and why the problem was fixed) also include
this same tracking number.