eigen

[Ross Ihaka]

I don't know what the problem was, but I think I have a fix.  I have
replaced src/appl/eigen.c by the original set of fortran eispack routines. 
This seems to fix the problem on my Solaris box. 

I suspect that this bug may have been there for a while.

I am still puzzled that it was not tripped on my FreeBSD box.  It must be
the advanced compiler technology; it silently finds and fixes the bugs in
your code as you compile it :-).

Anyway could someone check that this change does the job on Linux etc.
(I've committed in both branches).

	Ross

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