1 - new public function libssh2_trace() that enables tracing/debug output on

various stuff if libssh2 was built with debug. If built without debug, the
 function does nothing.
2 - configure --enable-debug is now enough to build a debug version (including
picky compiler options)
3 - internally, we no longer need/use #ifdef/#endif around all uses of the
_libssh2_debug() function/macro.

The scp.c example is the first application to test this new debug logging.

example/simple/scp.c

@@ -1,5 +1,5 @@
 /*
- * $Id: scp.c,v 1.3 2007/02/01 22:39:45 bagder Exp $
+ * $Id: scp.c,v 1.4 2007/02/02 23:23:36 bagder Exp $
  *
  * Sample showing how to do a simple SCP transfer.
  */
@@ -61,6 +61,9 @@ int main(int argc, char *argv[])
 	if(!session)
 		return -1;
 
+	/* trace transport layer stuff*/
+	libssh2_trace(session, LIBSSH2_TRACE_TRANS);
+
 	/* ... start it up. This will trade welcome banners, exchange keys,
 	 * and setup crypto, compression, and MAC layers
 	 */