Use default username for gnusocial admin

src/freedombone

 function create_database {
     app_name="$1"
     app_admin_password="$2"
+    app_admin_username=$3
     if [ ! -d $INSTALL_DIR ]; then
         mkdir $INSTALL_DIR
     fi
+    if [ ! $app_admin_username ]; then
+        app_admin_username=${app_name}admin
+    fi
     echo "create database ${app_name};
-CREATE USER '${app_name}admin@localhost' IDENTIFIED BY '${app_admin_password}';
-GRANT ALL PRIVILEGES ON ${app_name}.* TO '${app_name}admin@localhost';
+CREATE USER '$app_admin_username@localhost' IDENTIFIED BY '${app_admin_password}';
+GRANT ALL PRIVILEGES ON ${app_name}.* TO '$app_admin_username@localhost';
 quit" > $INSTALL_DIR/batch.sql
     chmod 600 $INSTALL_DIR/batch.sql
     mysql -u root --password="$MARIADB_PASSWORD" < $INSTALL_DIR/batch.sql
         else
             MICROBLOG_ADMIN_PASSWORD="$(openssl rand -base64 32)"
         fi
-        echo '' >> /home/$MY_USERNAME/README
-        echo '' >> /home/$MY_USERNAME/README
-        echo $'GNU Social' >> /home/$MY_USERNAME/README
-        echo '==========' >> /home/$MY_USERNAME/README
-        echo $"Your MariaDB gnusocial admin password is: $MICROBLOG_ADMIN_PASSWORD" >> /home/$MY_USERNAME/README
-        echo '' >> /home/$MY_USERNAME/README
-        chown $MY_USERNAME:$MY_USERNAME /home/$MY_USERNAME/README
-        chmod 600 /home/$MY_USERNAME/README
     fi
 
-    create_database gnusocial "$MICROBLOG_ADMIN_PASSWORD"
+    create_database gnusocial "$MICROBLOG_ADMIN_PASSWORD" $MY_USERNAME
 
     if [ ! -f "/etc/aliases" ]; then
         touch /etc/aliases
                             --dbtype=mysql --username="root" -v \
                             --password="$MARIADB_PASSWORD" \
                             --sitename="My Social Network" --fancy='yes' \
-                            --admin-nick="gnusocialadmin" \
+                            --admin-nick="$MY_USERNAME" \
                             --admin-pass="$MICROBLOG_ADMIN_PASSWORD" \
                             --site-profile="community" \
                             --ssl=${gnu_social_ssl}
     echo "GNU Social onion domain:${MICROBLOG_ONION_HOSTNAME}" >> $COMPLETION_FILE
 
     # some post-install instructions for the user
-    if ! grep -q $"To set up your microblog go to" /home/$MY_USERNAME/README; then
+    if ! grep -q $"Microblog administrator" /home/$MY_USERNAME/README; then
         echo '' >> /home/$MY_USERNAME/README
         echo '' >> /home/$MY_USERNAME/README
         echo $'Microblog' >> /home/$MY_USERNAME/README
         echo '=========' >> /home/$MY_USERNAME/README
-        echo $"Microblog administrator nickname: gnusocialadmin" >> /home/$MY_USERNAME/README
+        echo $"Microblog administrator nickname: $MY_USERNAME" >> /home/$MY_USERNAME/README
         echo $"Microblog administrator password: $MICROBLOG_ADMIN_PASSWORD" >> /home/$MY_USERNAME/README
         echo '' >> /home/$MY_USERNAME/README
-        echo $'Under the *Access* settings:' >> /home/$MY_USERNAME/README
-        echo '    /Invite only/ ticked' >> /home/$MY_USERNAME/README
-        echo '' >> /home/$MY_USERNAME/README
         chown $MY_USERNAME:$MY_USERNAME /home/$MY_USERNAME/README
         chmod 600 /home/$MY_USERNAME/README
     fi