#16937: document that stdin is always buffered, even when -u is used.  Patch by Elena Oat.
#14853: remove test that was making too many assumptions about stdin.  Patch by Elena Oat.
Issue #18549: Eliminate dead code in socket_ntohl().
CID 982369
#18503: small cleanups in test_email.

Patch by Vajrasky Kok.
#15130: remove repeat of abstract paragraph from socket howto body.

Patch by Tshepang Lekhonkhobe.
Issue #18556: Check the return value for PyUnicode_AsWideChar() in
U_set() from ctypes.

CID #486657