[installation] Change to nightly

etc/descriptions/scwfas.xml

@@ -51,15 +51,6 @@
 				as input to setSource().
 				</description>
 			</parameter>
-			<group name="arclink">
-				<parameter name="port" type="int" default="-1">
-					<description>
-					The server port for Arclink connections. -1
-					deactivates the Arclink server. The standard Arclink port is
-					18001.
-					</description>
-				</parameter>
-			</group>
 			<group name="fdsnws">
 				<parameter name="port" type="int" default="8080">
 					<description>