2024-03-13: I noticed that the numerical tests in create_echosounder.R fail.
The plots look slightly different, also. I don't know why this is. But I
also have no way of knowing if the tests are valid, because they are merely
comparing against results I had noted in 2012 or a couple of years before.
(Had these check values even corresponded to the setup used now?) I do not
plan to look into this further because I don't have software that can check
the values. If I were looking at new echosounder data, then I might have
access to official software that could be checked. That is my criterion for
spending time on the code, trying to regress across perhaps over a thousand
commits to oce. I do not want to update the built-in dataset, either, because
possibly it is in use by somebody in the community, so changing it ought to
be for a well-supported reason.