waf check -- Should it always run tests?

[Hal Murray]

verm at darkbeer.org said:
> I have a patch I'm working on now that will change this.  If you touch any
> files  that are dependencies of tests it will re-build and re-run those
> tests. 

Please set things up so that it runs the tests again, even if nothing has 
changed.  (It doesn't have to rebuild things.)

It's reasonable for tests to use a random number generator so running again 
may not be redundant.  Or maybe I'm chasing a weird bug where I'd like to put 
things into a loop for a while to see if I can tickle a timing problem.

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