OPTIM: splicing: use splice() for the last block when relevant

OPTIM: splicing: use splice() for the last block when relevant

Splicing is avoided for small transfers because it's generally cheaper
to perform a couple of recv+send calls than pipe+splice+splice. This
has the consequence that the last chunk of a large transfer may be
transferred using recv+send if it's less than 4 kB. But when the pipe
is already set up, it's better to use splice() to read the pending data,
since they will get merged with the pending ones. This is what now
happens everytime the reader is slower than the writer.

Note that this change alone could have fixed most of the CPU hog bug,
except at the end when only the close was pending.