testall target

[Eric Wilhelm]

# from Andy Armstrong
# on Sunday 30 September 2007 14:38:

>M::B provides a testall target - but it doesn't.

It doesn't know about the xt directory yet.  The testall target came 
from when I was trying to solve this using file extensions 
(e.g. '.at'), but I've since decided that that approach is much less 
flexible and usable than the directory.

We can certainly override testall if you want.

--Eric
-- 
"Beware of bugs in the above code; I have only proved it correct, not
tried it."
--Donald Knuth
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