[installation] Change to nightly

etc/descriptions/screpick.xml

@@ -61,7 +61,7 @@
 				<option flag="" long-flag="ep" argument="file">
 					<description>
 					Name of input XML file (SCML) with all picks for offline
-					processing.
+					processing. Use '-' to read from stdin.
 					</description>
 				</option>
 			</group>
@@ -78,6 +78,14 @@
 					</description>
 				</option>
 			</group>
+			<group name="Output">
+				<option flag="f" long-flag="formatted">
+					<description>
+					Use formatted XML output along with '--ep'. Otherwise XML
+					is unformatted.
+					</description>
+				</option>
+			</group>
 		</command-line>
 	</module>
 </seiscomp>