README: correct typo (lib.index)

lib.tex: include libfcntl, libposixfile
myformat.sty: add tableii environment
libfcntl.tex, libposixfile.tex: docs contributed by Jaap V

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+% Manual text by Jaap Vermeulen
+\section{Built-in module \sectcode{fcntl}}
+\bimodindex{fcntl}
+\indexii{UNIX}{file control}
+\indexii{UNIX}{IO control}
+
+This module performs file control and IO control on file descriptors.
+It is an interface to the \dfn{fcntl()} and \dfn{ioctl()} \UNIX routines.
+File descriptors can be obtained with the \dfn{fileno()} method of a
+file or socket object.
+
+The module defines the following functions:
+
+\renewcommand{\indexsubitem}{(in module struct)}
+
+\begin{funcdesc}{fcntl}{fd\, op\, arg}
+  Perform the requested operation on file descriptor \code{\var{fd}}.
+  The operation is defined by \code{\var{op}} and is operating system
+  dependent.  Typically these codes can be retrieved from the library
+  module \code{FCNTL}. The argument \code{\var{arg}} is optional.  When
+  it is missing it is interpreted as the integer value \code{0}. When
+  it is present, it can either be an integer value, or a string.  With
+  the argument missing or an integer value, the return value of this
+  function is the integer return value of the real \code{fcntl()}
+  call.  When the argument is a string it represents a binary
+  structure, e.g.  created by \code{struct.pack()}. The binary data is
+  copied to a buffer whose address is passed to the real \code{fcntl()}
+  call.  The return value after a successful call is the contents of
+  the buffer, converted to a string object.  In the case the
+  \code{fcntl()} fails, an \code{IOError} will be raised.
+\end{funcdesc}
+
+\begin{funcdesc}{ioctl}{fd\, op\, arg}
+  This function is identical to the \code{fcntl()} function, except
+  that the operations are typically defined in the library module
+  \code{IOCTL}.
+\end{funcdesc}
+
+If the library modules \code{FCNTL} or \code{IOCTL} are missing, you
+can find the opcodes in the C include files \code{sys/fcntl} and
+\code{sys/ioctl}. You can create the modules yourself with the h2py
+script, found in the \code{Demo/scripts} directory.
+
+Examples (all on a SVR4 compliant system):
+
+\bcode\begin{verbatim}
+import struct, FCNTL
+
+file = open(...)
+rv = fcntl(file.fileno(), FCNTL.O_NDELAY, 1)
+
+lockdata = struct.pack('hhllhh', FCNTL.F_WRLCK, 0, 0, 0, 0, 0)
+rv = fcntl(file.fileno(), FCNTL.F_SETLKW, lockdata)
+\end{verbatim}\ecode
+
+Note that in the first example the return value variable \code{rv} will
+hold an integer value; in the second example it will hold a string
+value.