See https://github.com/gwkkwg/metabang-bind/issues/closed#issue/3

whoopts; meant for this to go into the previous comment.

(reported by https://github.com/tpapp)

* finally removed the long deprecated *bind-treat-values-as-values*

* added :labels to complement :flet and fixed :flet to accept an
optional declaration form (coincidently noticed by me and
https://github.com/scymtym in the same week!)

* fixed bug where the array binding form wasn't correctly handling
underscore as ignore

* added tests for flet with declarations, labels and handling
underscore as ignore (only some binding forms are checked so I
should write some more...)

Previously, nil was used to tell bind that  a place could be
ignored. Now you can also use _. This is (IMHO) easier to read.
For example:

    (bind (((a b _ d) (foo)))
      (list a b d))

etc.

The :re form didn't get updated for the changes needed
for :flet. This commit fixes that and updates the testsuite.

Also add tests for :flet and to prevent errors like

    (bind ((a b c)) ...)

or

    (bind (((:values a b c) 3 4 5)) ...)

These signal an error of type bind-too-many-value-forms-error

we don't need this for AG work.

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allow defbinding-form to _not_ use a extra layer of binding for values (to support :values and :function). Also, prevent variable capture of  in defbinding-form macro.

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