Allow to specify several characteristic polynomials in lattice with isometry enumeration

[simonbrandhorst]

• Allow lists of characteristic or minimal polynomials in enumerate_classes_of_lattices_with_isometry
• disable expensive check

[StevellM]

Thanks, that is something good to have. However, I am not completely happy with the interface. Since it only touches keyword arguments, I would be in favour to remove the previous interface and just keep lists of "bla" instead of accumulating keyword arguments. You did it in some places, in other places you added extra shortcut functions to fit with the previous interface and in other places you completely removed the previous interface. Which is not consistent. I think we could just replace the previous interface to give lists of eiglat_cond, char_poly and min_poly. I could live with adding brackets in my code where needed. If you think we should still support the previous interface, then we should probably add aliases that transform standalone keyword arguments into lists of one element.

[StevellM]

We talked about, at some point. to change conditions on rank and signature by ranges or lists instead of single integers. Does having lists of triples a good enough solution or should we think about extending the interface to that, up to modify admissible_triples and related functions accordingly ?

[simonbrandhorst]

I just needed to write something that is backwards compatible. I am OK with deprecating the old interface.
But I think that in the long run we need an object the curates all conditions one may want to impose and
checks for consistency etc.