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Performing a cover operation then exchange operations in the new charts.

the same as of `design/cover`,
a list of polynomials from k[S], representatives for the elements to be put into the IND member of the charts,
a list of indices to IND, the positions where the exchange has to be performed,
output parameter, the list of singletons containing the indices in the new charts that were eventually exchanged.
A list of chart-records, with the indicated exchanges made.
The procedure functions like `design/cover`, but it performs an additional exchange operation on the new charts. The Z parameter is necessary because the generators of CP might be rearranged and some of them might be dropped, and we need to know which polynomials were exchanged in the output charts.

The procedure adopts to the chosen representation of invertible functions (determined by useDEP2).

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