[TIP] RFC: Add TestResult.done()

[Robert Collins]

JML's testtools has a TestResult subclass with a done() method. The
reason for this method is to allow doing things after the last test has
run. While a result can infer 'first test' it can't infer 'last test'
without ugliness like __del__.

Some uses for this are:
 - reporting summary data
 - closing external resources like log files, sockets to remote machines
etc
 - <your idea here>

This can be added quite safely I think - check for the attribute, and if
present call it.

done() could be spelt differently - I don't think anyone would care.
testsFinished()
finished()
etc.

I was prompted to send this mail, as I just needed to run some code in a
TestResult after all the tests in a different project, and remembered
its not part of the stdlib yet :)

-Rob
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