awk macro: proper fs semantics in paragraph mode.

* share/txr/stdlib/awk.tl (sys:awk-state): New
slots: par-mode, par-mode-fs, par-mode-prev-fs.
(sys:awk-state rec-to-f): In paragraph mode,
detect that fs has changed since the last call.
In that case, take the user's fs and add to it
a newline match. If it is a regex, take the source,
add the syntax and recompile the regex. If it's
a string, build regex around it and compile.
(sys:awk-state loop): Maintain the par-mode-t
variable in the state structure as the rs
value triggers transitions into or out of
paragraph mode.

* txr.1: Updated documentation for rs.

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