add `deprecate` helper notation; no `perm` in non-`perm_eq` lemma names

- add notation support for lemma renaming PRs, helping clients adjust
to the name change by emitting warning or raising errors when the old
name is used. The default is to emit warnings, but clients can change
this to silence (if electing to delay migration) or errors (to help
with actual migration). Usage:
  Notation old_id := (deprecate old_id new_id) (only parsing).
—> Caveat 1: only prenex maximal implicit of `new_id` are preserved, so,
as `Notation` does not support on-demand implicits, the latter should
be added explicitly as in `(deprecate old new _ _)`.
—> Caveat 2: the warnings are emitted by a tactic-in-term, which
is interpreted during type elaboration. As the SSReflect elaborator may
re-infer type in arguments multiple times (notably, views and arguments
to `apply` and `rewrite`), clients may see duplicate warnings.
- use the `deprecate` facility to introduce the first part of the
refactoring of `seq` permutation lemmas : only lemmas concerning
`perm_eq` should have `perm` as a component of their name.
- document local additions in `ssreflect.v` and `ssrbool.v`
- add 8.8 `odd-order` regression
- the explicit beta-redex idiom use in the `perm_uniq` and
`leq_min_perm` aliases avoids a strange name-sensitive bug of view
interpretation in Coq 8.7.

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