BUG/MEDIUM: channel:  bo_getline() must wait for \n until buffer is full

We must not report incomplete data if the buffer is not full, otherwise
we can abort some processing on the stats socket when dealing with massive
amounts of commands.
CLEANUP: check: server port is unsigned

Baptiste Assmann reported some confusing printf() output of the server
port since it's declared signed. Better turn it to unsigned.

There's no need to backport this, it's only used in 16-bit places.
DOC: compression: chunk are not compressed anymore

Add the chunk issue to the list of non-working cases.