Bug report ID:635627 - subst([...] is order-dependent

FWIW,
The commercial Macsyma doesn't define how subst should work, however, 
the description for lratsubst states that
the substitutions are done in order, from left to right.
Dan Stanger
Barton Willis wrote:
>> I think it's bad to change subst to do parallel because that changes
>> existing behavior.  There could be lots of code out there that depends
>> on this and we should gratuitiously break them.
>>      
> I agree. My enthusiasm for breaking existing code is low. But the user
> documentation for subst doesn't specify the substitution order (or
> simplification order), so there is an argument for saying that code
> that depends on a specific substitution order is buggy.
>
> --Barton
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