added tagfile and make use of it in modules

lib/filefct.sh

@@ -211,6 +211,23 @@ patchfile()
     unset rights dstfile
 }
 
+
+# ------------------------------------------------------------------------------
+# Put a small header in a file showing it have been automatically modified
+tagfile()
+{
+    for f in $@; do
+        local text="# File automatically modified by init.sh on $(stdtime)."
+        if [[ -e $f ]]; then
+            sed -i "1s/^/$text\n/" $f
+        else
+            echo $text > $f
+            sed -i -e "s/modified/generated/" $f
+        fi
+    done
+}
+
+
 # ------------------------------------------------------------------------------
 # check a file exists and return error if not
 file_exists()