[Scheme-reports] multiple values, and, or, when, unless

[Andy Wingo <wingo@x>]

The specification for `and' notes that "If all the expressions evaluate
to true values, the value of the last expression is returned."  This is
not the case: as the last expression is in tail context, the _values_ of
the last expression are returned.  Same with `or', `when', and
`unless'.

Contrary to their specifications and the "differences from r6rs"
appendix, the return value of `when' and `unless' is indeed specified if
the body is evaluated, as the body is in tail position.

Andy
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