[exninfo] Deprecate aliases for exception re-raising.

We make the primitives for backtrace-enriched exceptions canonical in
the `Exninfo` module, deprecating all other aliases.

At some point dependencies between `CErrors` and `Exninfo` were a bit
complex, after recent clean-ups the roles seem much clearer so we can
have a single place for `iraise` and `capture`.

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