`rdRecs` is inappropriate in the flow-control sensitive settings here where select only ensures a single `read` will not block, not a loop.
`rdRecs` is inappropriate in the flow-control sensitive settings here
where select only ensures a single `read` will not block, not a loop.

Instead, re-instate `Filter.off` field and `moveMem` processing, but
generalize to any char-terminator in a template dispatched from the old
2 entry points.

Since this also re-instates a reply size < buffer size constraint, also
add a way for users to increase buffer sizes which makes other reply
framing iterators more capable.

c-blake/cligen