Fixed SSL support on the httpd component, and also on the EiffelWeb standalone connector.

- the standalone connector support for SSL, is using certicate files for now (no in-memory support).
  - to enable ssl support, set ecf variable `httpd_ssl_enabled=true`.
  - added the `simple_ssl` example to demonstrate how to have standalone ssl server.
    (be careful when using EiffelNet SSL and the http_client library, disable the libcurl
      via ecf variable `libcurl_http_client_disabled=true` )

Added support for recv timeout to the EiffelWeb standalone connector.
  - made EiffelWeb compilable with 16.05 and upcoming 16.11.
    Done via ecfs condition on version to accept EiffelNet with recv_timeout (from 16.11), and without (until 16.05).
  - adding recv timeout prevents server to hang for ever if a client wait too long to send data.

Updated various comments.

library/server/ewsgi/connectors/standalone/src/implementation/wgi_httpd_request_handler.e

@@ -230,6 +230,9 @@ feature -- Request processing
 			set_environment_variable (l_server_port, "SERVER_PORT", Result)
 			set_environment_variable (version, "SERVER_PROTOCOL", Result)
 			set_environment_variable ({HTTPD_CONFIGURATION}.Server_details, "SERVER_SOFTWARE", Result)
+			if is_secure then
+				set_environment_variable ("on", "HTTPS", Result)
+			end
 
 				--| Apply `base' value
 			l_base := base

library/server/ewsgi/connectors/standalone/src/wgi_standalone_connector.e

@@ -2,8 +2,8 @@ note
 	description: "[
 			Standalone Web Server connector.
 		]"
-	date: "$Date$"
-	revision: "$Revision$"
+	date: "$Date: 2016-08-06 13:34:52 +0200 (sam., 06 août 2016) $"
+	revision: "$Revision: 99106 $"
 
 class
 	WGI_STANDALONE_CONNECTOR [G -> WGI_EXECUTION create make end]
@@ -155,6 +155,12 @@ feature -- Element change
 			set_is_verbose_on_configuration (b, configuration)
 		end
 
+	set_is_secure (b: BOOLEAN)
+			-- Set is_secure connection mode.
+			-- i.e: using SSL.
+		do
+			set_is_secure_on_configuration (b, configuration)
+		end
 
 feature -- Server
 
@@ -242,6 +248,11 @@ feature {NONE} -- Implementation: element change
 			cfg.set_is_verbose (b)
 		end
 
+	set_is_secure_on_configuration (b: BOOLEAN; cfg: like configuration)
+		do
+			cfg.set_is_secure (b)
+		end
+
 
 note
 	copyright: "2011-2016, Jocelyn Fiat, Javier Velilla, Eiffel Software and others"

library/server/ewsgi/connectors/standalone/src/wgi_standalone_constants.e

@@ -0,0 +1,18 @@
+note
+	description: "[
+			Constants value related to Standalone connector,
+			and indirectly to `httpd' component.
+		]"
+	author: "$Author$"
+	date: "$Date$"
+	revision: "$Revision$"
+
+deferred class
+	WGI_STANDALONE_CONSTANTS
+
+inherit
+	ANY
+
+	HTTPD_CONSTANTS
+
+end