Remove old fluid tag from project file.

xml/removeFluid.sh

+#!/usr/bin/env bash
+
+set -x
+
+# delete fluid
+xmlstarlet ed --delete "//OpenGeoSysProject/processes/process/fluid" $1 > /tmp/removedFluid.prj
+# format the result file
+xmlstarlet fo -s 4 /tmp/removedFluid.prj > ${1}