EOU suggestion for build

[Jonathan Gibbons]

Sometimes, after updating a forest, you can get a message that the 
generated configure is out of date and needs  to be regenerated. Then, 
when you regenerate it, you get warnings that you *should* do a make clean.

How about providing a make target that reruns ./configure with the same 
options as before, and does a "make clean", so that after refreshing a 
forest, you can refresh your build?

-- Jon