ret, aret: take one argument, as documented.

* stdlib/op.tl (ret, aret): Simplify implementation, without
progn or @rest, or interpolation of multiple args.
We use identity* to allow the resulting function to
allow and ignore multiple arguments.

* txr.1: Strangely, an an edit in commit 99131c676,
on Sep 26, 2014, reverted the more accurate equivalence
(ret x) <--> (op identity (progn @rest x))
back to the original documentation
(ret x) <--> (op identity x)
which matched an older implementation. Anyway, that's moot
now; the documentation is updated to give the new equivalence
via identity*.

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