[Scheme-reports] Updated sets pre-SRFI and implementation

[John Cowan <cowan@x>]

The implementation was lacking several tests (and consequently
several procedures).  I have rectified that.

The spec now calls for -any, -count, -every, -filter, -find, -partition,
-remove, and -unfold procedures, but there are not yet implemented.

-- 
It was impossible to inveigle           John Cowan <cowan@x>
Georg Wilhelm Friedrich Hegel           http://www.ccil.org/~cowan
Into offering the slightest apology
For his Phenomenology.                      --W. H. Auden, from "People" (1953)

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