#2927 `fourier_elim' and `multiadditive' conflict

[Sergey Litvinov]

share/fourier_elim/fourier_elim.lisp and
share/multiadditive/multiadditive.lisp does not play well together.

(%i1) load("multiadditive") $
(%i2) load("fourier_elim") $
(%i3) declare(foo, multiadditive) $
(%i4) foo(a+b) $
Maxima encountered a Lisp error:

The value $A is not of type LIST.

Automatically continuing.
To enable the Lisp debugger set *debugger-hook* to nil.

I think the reason is that they both define a slightly different
version of `cartesian-product' function.

[Barton Willis]

This bug has been fixed:

(%i5)  load("multiadditive") $

(%i6) load("fourier_elim") $

(%i7) declare(foo, multiadditive) $

(%i8) foo(a+b);
(%o8)                           foo(b) + foo(a)