Updating to autoconf 2.52/automake 1.5

[Jeff Bailey]

Hello!

I've begun the steps of updating autoconf to version 2.52.  This will
probably take me about a week to do.  Many of the IU_ macros written
by Miles now exist in some form in autoconf and I want to get rid of
as many of them as possible.

Please don't commit stuff to configure.in in the mean time.  There's a
reasonable chance the change will get lost.

Tks,
Jeff Bailey

-- 
`Patience' said Slartibartfast again. `Great things are afoot'.
`That's what you said last time we met' said Arthur.
`They were,' said Slartibartfast.
`Yes, that's true,' admitted Arthur.