[m-rev.] for review: delete obsolete library predicates

[Zoltan Somogyi]

This diff deletes the library predicates that we obsoleted before 2019 Jan 1,
but keeps around the ones we have obsoleted since. Is everyone ok with that?

There should be announcement in NEWS, but should it be

- a single entry just saying "a bunch of obsolete preds/funcs were deleted",
- a single entry that also lists all the preds/funcs, or
- one entry per affected library module, listing all the preds/funcs in that module.

Any preferences?

I would like Julien to have a look at the update to the shift test. The rest of the
diff is boring.

Zoltan.
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