#15 Random element generation not working properly in extensions

If I generate a random element in an extension of some
ring using ZENEltSetRandom(), several elements never
occur as output. The reason is that ZENPolySetRandom()
is used with degree equal to the extension degree - 1
and, hence, the leading coefficient is always non-zero.
Thus, for example, the zero element is never generated
by ZENEltSetRandom() in extension rings.

[Anonymous]

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Tested with 3.0 r6 and 3.0 r7.

[Nobody/Anonymous]

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Suggestion for a fix: create a second ZENPolySetRandom()
method which creates a random polynomial of degree _at most_
d, and call it for example ZENPolySetRandomAtMost() or
whatsoever. Then use this one in the implementation of
ZENEltSetRandom().