matcher: left-to-right scoping for @(and).

And binds left to right now; only or is parallel.

* share/txr/stdlib/match.tl (compile-and-mach): Do not compile
the patterns with copies of the var list, but with he one and
only incoming var-list. Consequently, there are not var lists
to merge. par-pat parameter renamed to and-pat.

* txr.1: Improve and/or documentation, clarifying scope
rules. Also, clarify that variables in non-matching patterns
of an or are no set to nil, if they are existing bindings from
before the or.

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