#16 ZENEltPrintToString() problems with F_2 extensions

I created the ring (Z/2Z)[x]/(x+1) and tried to print
the element 1 into a string. The result is (0)*t^31+(1).
I know that this is not really a bug (in mathematically
sense), but it is still annoying as it makes the output
unnecessarily complicated. :-)

(Tested with 3.0 r6 and 3.0 r7.)

[Anonymous]

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I noticed that this problem also appears for other
extensions of F_2. The reason seems to be that polynomials
over F_2 always have a length of 2^n-1, as they are stored
as bit strings in BigNums and that ZENPolyPrintToString
seems in general to indicate the polynomial's length in its
output by adding a monomial (0)*x^length in front of the
``real'' polynomial. Hence, this seems to be a feature and
not a bug :)