https://github.com/oldk1332/fricas/commit/f8f2d04ca258c64b2f8e210b1dcf5484a1ae26ce.patch

add a reference, generalize over UPOLYCAT
fix compiler warnings:
1. fix comments of subresultantSequenceBegin
2. fix unused variable q in polsth2

==

https://github.com/oldk1332/fricas/commit/f8fe19313e55b22f5a8cf7450001b0c90ca13d4d.patch

relax type requirement

now allow UP of POLY INT to have subresultantSequence,
and UP of POLY INT with leadingCoefficient of INT to have
SturmHabichtSequence via function sign2.

======

I do the later commit because of the example from the reference:

B : UP(x, POLY INT):= x^4 + p * x^2 + q*x + r
SturmHabichtSequence (B, D B)
gives message of type mismatch.

Although POLY INT does not have OrderedIntegralDomain,
but its leadingCoefficient can be retract to INT, which have sign.
And SturmHabichtSequence of B and D B can be computed,
just like in the reference.

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