updated the dune install script

bin/install_all_dune_modules.sh

 #!/usr/bin/env bash
 
 if [ $# -lt 1 ]; then
-  echo "usage: $0 DOWNLOAD_DIR"
+  echo "usage: $0 DUNE_BASE_DIR"
   exit 1
 fi
 
-DOWNLOAD_DIR="$1"
+DUNE_BASE_DIR="$1"
 
-mkdir -p ${DOWNLOAD_DIR}/dune
-cd ${DOWNLOAD_DIR}/dune
+mkdir -p ${DUNE_BASE_DIR}
+cd ${DUNE_BASE_DIR}
 
 CORE_MODULES=("dune-common" "dune-geometry" "dune-grid" "dune-istl" "dune-localfunctions")
 STAGING_MODULES=("dune-functions" "dune-typetree" "dune-uggrid")
@@ -29,6 +29,7 @@ done
 echo ""
 echo "=============================================================="
 echo "To build all dune modules run the commands...                 "
-echo "  DUNE_CONTROL_PATH=${DOWNLOAD_DIR}/dune dunecontrol configure"
-echo "  DUNE_CONTROL_PATH=${DOWNLOAD_DIR}/dune dunecontrol make -j4 "
+echo "  export PATH=${DUNE_BASE_DIR}/dune-common/bin:\${PATH}"
+echo "  DUNE_CONTROL_PATH=${DUNE_BASE_DIR} dunecontrol configure"
+echo "  DUNE_CONTROL_PATH=${DUNE_BASE_DIR} dunecontrol make -j4 "
 echo "=============================================================="
\ No newline at end of file