Try to be more robust on errors

The objective is to always have a working http://doc.cgal.org/master

Documentation/doc/scripts/test_doxygen_versions.sh

@@ -1,4 +1,7 @@
 #!/bin/bash
+
+set -e
+
 if [ "$1" == '--help' ]; then
   echo "Usage: $0 <doxygen_1> [doxygen_2] [publish_dir]"
   echo "Compares the output of doxygen_1 and doxygen_2 of this CGAL version, "

Scripts/developer_scripts/run_doxygen_testsuite

@@ -65,7 +65,7 @@ export PATH
 cd "$PWD/doc/scripts"
 bash ./test_doxygen_versions.sh /home/cgal-testsuite/local/bin/doxygen '' /srv/CGAL/www/Members/Manual_doxygen_test
 case "$CGAL_RELEASE_ID" in
-    *-I-*) ln -snf "../Manual_doxygen_test/$CGAL_RELEASE_ID/output" /srv/CGAL/www/doc/master
+    *-I-*) rsync -a --delete "../Manual_doxygen_test/$CGAL_RELEASE_ID/output/" /srv/CGAL/www/doc/master/
            ;;
 esac
 rm -rf "${CGAL_DOC_BUILD}"