According to the documentation of python 3 socket::send method
(https://docs.python.org/3/library/socket.html#socket.socket.send

),
the call to send must be retry until all data is sent while sending
packet with a "large" amount of data.

Signed-off-by: Jerome Malinge <gromgromm@yahoo.com>

Closes #1459. Thanks to Thomas Markin Klein.

Closes #1453. Thanks to jveber.

Closes #1442. Thanks to charlemagnelasse.

Closes #1441. Thanks to Christoph Krey.

Closes #1437. Thanks to Guillaume Bour.

Closes #1432. Thanks to Magnus Galåen.

Closes #1429. Thanks to Dustin Sallings.

Closes #1424, #1425. Thanks to JinPingChng and peteakalad.

Closes #1415 and #1422. Thanks to Karl Palsson, Till Zimmermann and Liam Fry.

Also update client documentation about automatic client ids.

Closes #1418. Thanks to Lichard Torman.

When attempting to update a user that does not exist.

Closes #1414. Thanks to kdgde.

Closes #1412. Thanks to Ryan Shaw.