upload.sh: --fresh flag

upload.sh

@@ -2,6 +2,14 @@
 
 set +e
 
+for arg in "$*"
+do
+  case "$arg" in
+    "--fresh") find ./html/ -type f -name '*.upload-checksum' -delete
+      ;;
+  esac
+done
+
 for cur in ./html/{*,*/*,*/*/*}; do
   if [ -f "$cur" ] && [[ ! "$cur" == *.upload-checksum ]]; then
     if [ -f "$cur.upload-checksum" ]; then