_zseries_div(z1, z2)
Divide :None:None:`z1` by :None:None:`z2` and return the quotient and remainder as z-series. Warning: this implementation only applies when both z1 and z2 have the same symmetry, which is sufficient for present purposes.
This is not the same as polynomial division on account of the desired form of the remainder. If symmetric/anti-symmetric z-series are denoted by S/A then the following rules apply:
S/S -> S,S A/A -> S,A
The restriction to types of the same symmetry could be fixed but seems like unneeded generality. There is no natural form for the remainder in the case where there is no symmetry.
The arrays must be 1-D and have the same symmetry, but this is not checked.
Quotient and remainder as z-series.
Divide the first z-series by the second.
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