Merge branch 'mark_top' into 'develop'

Marks top of the experiment tree with a file

See merge request esm-tools/esm-runscripts!194

functions/general/general_gather_information.functions

@@ -202,6 +202,10 @@ general_set_directory_paths()
 	else
 		TOPLEVEL=${BASE_DIR}/${EXP_ID}
 	fi
+        # Mark the top of the experiment with a small file, this makes
+        # programatically finding things from anywhere in the experiment tree
+        # easier:
+        echo "Top of experiment ${EXP_ID}" > ${TOPLEVEL}/.top_of_exp_tree
 
         WORK_DIR=${TOPLEVEL}/work/
 	LOG_DIR=${TOPLEVEL}/log/