awk: new feature: again operator.

* share/txr/stdlib/awk.tl (sys:awk-state loop):
Wrap a loop around around the two forms that
split the record into fields and dispatch the main
rule function. The loop repeats if the named
block returns :awk-again.
(sys:awk-mac-let): New local macro (again)
which bails out of the :awk-rec block just like (next) does,
but specifies :awk-again as the return value.

* txr.1: Documented.

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