fixes #143 Protocols and transports should be "configurable"

This makes all the protocols and transports optional.  All
of them except ZeroTier are enabled by default, but you can
now disable them (remove from the build) with cmake options.

The test suite is modified so that tests still run as much
as they can, but skip over things caused by missing functionality
from the library (due to configuration).

Further, the constant definitions and prototypes for functions
that are specific to transports or protocols are moved into
appropriate headers, which should be included directly by
applications wishing to use these.

We have also added and improved documentation -- all of the
transports are documented, and several more man pages for
protocols have been added.  (Req/Rep and Surveyor are still
missing.)

1 files changed, 28 insertions, 0 deletions

diff --git a/src/protocol/reqrep0/rep.h b/src/protocol/reqrep0/rep.h
new file mode 100644
index 00000000..93df9379
--- /dev/null
+++ b/src/protocol/reqrep0/rep.h
@@ -0,0 +1,28 @@
+//
+// Copyright 2017 Garrett D'Amore <garrett@damore.org>
+// Copyright 2017 Capitar IT Group BV <info@capitar.com>
+//
+// This software 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.
+//
+
+#ifndef NNG_PROTOCOL_REQREP0_REP_H
+#define NNG_PROTOCOL_REQREP0_REP_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+NNG_DECL int nng_rep0_open(nng_socket *);
+
+#ifndef nng_rep_open
+#define nng_rep_open nng_rep0_open
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // NNG_PROTOCOL_REQREP0_REP_H