gap-system / gap / 9217

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Change StructureDescription for infinite cyclic group

It used to be C0, now we refer to it as Z (as in: the integers), which
should be understood by more people without consulting the manual. Also,
the short name "0" is likewise replace by 0.

This is also consistent with what the RCWA package does in its custom
StructureDescription method.

15 of 16 new or added lines in 1 file covered. (93.75%)

288855 of 339798 relevant lines covered (85.01%)

22529359.73 hits per line