Patch #823072: add option to NOT use ~/.netrc in nntplib.NNTP().

Doc/lib/libnntplib.tex

@@ -54,12 +54,14 @@ The module itself defines the following items:
 
 \begin{classdesc}{NNTP}{host\optional{, port
                         \optional{, user\optional{, password
-			\optional{, readermode}}}}}
+			\optional{, readermode}
+			\optional{, usenetrc}}}}}
 Return a new instance of the \class{NNTP} class, representing a
 connection to the NNTP server running on host \var{host}, listening at
 port \var{port}.  The default \var{port} is 119.  If the optional
 \var{user} and \var{password} are provided, 
-or if suitable credentials are present in \file{~/.netrc},
+or if suitable credentials are present in \file{~/.netrc} and the
+optional flag \var{usenetrc} is true (the default),
 the \samp{AUTHINFO USER} and \samp{AUTHINFO PASS} commands are used to
 identify and authenticate the user to the server.  If the optional
 flag \var{readermode} is true, then a \samp{mode reader} command is
@@ -68,6 +70,9 @@ necessary if you are connecting to an NNTP server on the local machine
 and intend to call reader-specific commands, such as \samp{group}.  If
 you get unexpected \code{NNTPPermanentError}s, you might need to set
 \var{readermode}.  \var{readermode} defaults to \code{None}.
+\var{usenetrc} defaults to \code{True}.
+
+\versionchanged[\var{usenetrc} argument added]{2.4}
 \end{classdesc}
 
 \begin{classdesc}{NNTPError}{}