[Axiom-developer] [#211 Products are differentiated incorrectly] fix

[kratt6]

Changes 
http://wiki.axiom-developer.org/211ProductsAreDifferentiatedIncorrectly/diff
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Fortunately, a fix is quite easy, since we know how to differentiate products 
according to Leibniz rule: Here is a patch to 'combfunc.spad.pamphlet' that 
also fixes some leftover problems with differentiating sums without bounds and 
displaying sums and products with and without bounds:

<a href="combfunc.spad.pamphlet.patch">combfunc.spad.pamphlet.patch</a>
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forwarded from http://wiki.axiom-developer.org/address@hidden