Make base_ring_type work for (M)SeriesRing #1686
Merged
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These signatures were wrong but since we run no conformance tests on
these rings we never noticed...
Of course there should also be tests. But guess what, rings that we did not conformance tests are not conformant... plus one has to add `test_elem` methods in order to run the conformance tests.So let's get this fix out now and add tests later.UPDATE: Actually it wasn't so bad to get the conformance tests added, I just made a silly mistake earlier. So I added those tests now and a few extra ones as bonus. Problems only pop up with the "recursive" conformance tests, which I therefore skipped. (Several ring types still are not tested for conformance at all.)