matcher: bugfix and interface change in @(require).

* share/txr/stdlib/match.tl (compile-require-match): The bug
here is that the condition is placed before the
match.test-expr, which is incorrect. The conditions can only
be evaluated if match.test-expr has succeeded, because
otherwise the variables are not validated to have the
correctly matching value. Also, in the documentation,
the synax insinuates there can be more than one expression. So
let's just make it work: require takes multiple expressions
and combines them with an implicit and.

* txr.1: Documentation updated.

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