fixes #286 nng_pair0_open (and all others) need man page

fixes #279 consider restructuring man sections

This represents a rather significant rework, and major editing
effort, for the entire set of manual pages.

All of the pages now have a section number in their filename;
this assists in some other tooling, particularly ebook generation
as every link needs to be programmatically modified when combined
into an ebook.

Section 5 is introduced, and populated with pages for the main
types, and all options are now documented.

Numerous errors have been corrected, including rewriting certain
portions such as the header section of the surveyor protocol.

Much work has been done to facilitate index generation, although
certainly more work remains here.

Every internal link within these pages now resolves; there are no
more dead links.  (This is required to generate Kindle format books.)

1 files changed, 0 insertions, 79 deletions

diff --git a/docs/man/nng_recv.adoc b/docs/man/nng_recv.adoc
deleted file mode 100644
index f9f8f1dd..00000000
--- a/docs/man/nng_recv.adoc
+++ /dev/null
@@ -1,79 +0,0 @@
-= nng_recv(3)
-//
-// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
-// Copyright 2018 Capitar IT Group BV <info@capitar.com>
-//
-// This document is supplied under the terms of the MIT License, a
-// copy of which should be located in the distribution where this
-// file was obtained (LICENSE.txt).  A copy of the license may also be
-// found online at https://opensource.org/licenses/MIT.
-//
-
-== NAME
-
-nng_recv - recv data
-
-== SYNOPSIS
-
-[source, c]
------------
-#include <nng/nng.h>
-
-int nng_recv(nng_socket s, void *data, size_t *sizep int flags);
------------
-
-== DESCRIPTION
-
-The `nng_recv()` receives a message.
-
-If the special flag `NNG_FLAG_ALLOC` is not specified, then the caller must
-set _data_ to a buffer to receive the message body content, and must store
-the size of that buffer at the location pointed to by _sizep_.  When the
-function returns, if it is successful, the size at _sizep_ will be updated with
-the actual message body length copied into _data_.
-
-If the special flag `NNG_FLAG_ALLOC` is present, then a "zero-copy" mode is
-used.  In this case the caller must set the value of _data_ to the location
-of another pointer (of type `void *`), and the _sizep_ pointer must be set
-to a location to receive the size of the message body.  The function will then
-allocate a message buffer (as if by <<nng_alloc#,nng_alloc(3)>>), fill it with
-the message body, and store it at the address referenced by _data_, and update
-the size referenced by _sizep_.  When this flag is present, the caller assumes
-responsibility for disposing of the received buffer either by the function
-<<nng_free#,nng_free(3)>> or reusing the message for sending (with the same
-size) via <<nng_send#,nng_send(3)>>.
-
-NOTE: The semantics of what receiving a message means vary from protocol to
-protocol, so examination of the protocol documentation is encouraged.  (For
-example, with an <<nng_req#,nng_req(7)>> socket a message may only be received
-after a request has been sent, and an <<nng_sub#,nng_sub(7)>> socket
-may only receive messages corresponding to topics to which it has subscribed.)
-Furthermore, some protocols may not support receiving data at all, such as
-<<nng_pub#,nng_pub(7)>>.
-
-TIP: The `NNG_FLAG_ALLOC` flag can be used to reduce data copies, thereby
-increasing performance, particularly if the buffer is reused to send
-a response using the same flag.
-
-== RETURN VALUES
-
-This function returns 0 on success, and non-zero otherwise.
-
-== ERRORS
-
-`NNG_EAGAIN`:: The socket _s_ cannot accept data for sending.
-`NNG_ECLOSED`:: The socket _s_ is not open.
-`NNG_EINVAL`:: An invalid set of _flags_ was specified.
-`NNG_EMSGSIZE`:: The received message did not fit in the size provided.
-`NNG_ENOMEM`:: Insufficient memory is available.
-`NNG_ENOTSUP`:: The protocol for socket _s_ does not support receiving.
-`NNG_ESTATE`:: The socket _s_ cannot receive data in this state.
-
-== SEE ALSO
-
-<<nng_alloc#,nng_alloc(3)>>,
-<<nng_free#,nng_free(3)>>,
-<<nng_recvmsg#,nng_recvmsg(3)>>,
-<<nng_send#,nng_send(3)>>,
-<<nng_strerror#,nng_strerror(3)>>,
-<<nng#,nng(7)>>