add additional post-install shell script option for setup_status_network.sh to do any other site-specific setup

scripts/setup.cfg.sample

@@ -15,3 +15,4 @@ export PHPBASE=/var/www/statusnet
 export WILDCARD=example.net
 export MAILTEMPLATE=/etc/statusnet/newsite-mail.txt
 export MAILSUBJECT="Your new StatusNet site"
+export POSTINSTALL=/etc/statusnet/morestuff.sh

scripts/setup_status_network.sh

@@ -72,3 +72,9 @@ then
 else
     echo "No mail template, not sending email."
 fi
+
+if [ -f "$POSTINSTALL" ]
+then
+    echo "Running $POSTINSTALL ..."
+    source "$POSTINSTALL"
+fi