Add opt-in insecure TLS mode to dop20 downloader

scripts/dlscript_dop20.sh

@@ -16,6 +16,12 @@ fi
 
 mkdir -p "$OUT_JP2" "$OUT_J2W" "$OUT_META"
 
+DOP20_CURL_OPTS=()
+if [[ "${DOP20_INSECURE:-}" == "1" ]]; then
+  DOP20_CURL_OPTS+=("-k")
+  echo "Warning: DOP20_INSECURE=1 set — skipping TLS verification." >&2
+fi
+
 while IFS= read -r url; do
   [[ -z "$url" || "$url" =~ ^# ]] && continue
   fname="${url##*/}"
@@ -30,7 +36,7 @@ while IFS= read -r url; do
     continue
   fi
   echo "Downloading $fname"
-  curl -fL "$url" -o "$dest"
+  curl -fL "${DOP20_CURL_OPTS[@]}" "$url" -o "$dest"
 done < "$LIST"
 
 echo "Done. Files in $OUT_JP2, $OUT_J2W, $OUT_META"