each-match macro family: missing anon block.

* txr.1: Adding the missing requirement that each-match
and the other macros in that family must have an implicit
anonymous block around the body forms. This is a requirements
bug, effectively: the programmer expects these operators to be
consistent with the each operator, as part of the same family.

* match.tl (each-match-expander): Implement the requirement.
Since we are using mapping functions, we must use temporary
variables: the evaluation of the expressions which produce the
sequence argument values to the mapping functions must be
outside of the anonymous block. The block must surround only
the function call.

* tests/011/patmatch.tl: Add small test case covering this.

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