Fixed a bug that prevented Yacy from indexing files with non ASCII filenames in FTP servers.

Previously Yacy could read file listings in UTF-8, but couldn't send commands to the FTP server in UTF-8 (the second byte of every multi-byte character was ignored), which caused a lot of errors on the server side.
Now it handles UTF-8 correctly.

source/net/yacy/cora/protocol/ftp/FTPClient.java

@@ -1969,7 +1969,8 @@ public class FTPClient {
     // protocoll socket commands
 
     private void send(final String buf) throws IOException {
-        this.clientOutput.writeBytes(buf);
+        byte[] b = buf.getBytes("UTF-8");
+        this.clientOutput.write(b, 0, b.length);
         this.clientOutput.write('\r');
         this.clientOutput.write('\n');
         this.clientOutput.flush();