RFC: supporting code review and partial commits better

[Vincent Ladeuil]

>>>>> "robert" == Robert Collins <robertc at robertcollins.net> writes:

<snip/>

    robert> There were two cool ideas here - one was coverage ->
    robert> mark the regions covered; and tests -> mark the
    robert> things failing. Combining them should be pretty
    robert> powerful :)

And another one is links between code and tests so that from say,
gannotate, you can ask: "what tests are exercising that line ?"
or more commonly "where should I look if I want to add tests for
that code ?".

     Vincent