FTP Fer: Upload and manage files and folders in FTP server

This class can upload and manage files and folders in FTP server.

It can connect to a given FTP server on behalf of a given user using his password to perform several types of actions like:

- Setting the current FTP server directory
- List the files and directories in the current directory
- Upload to the FTP server a given file uploaded via Web forms
- Create, rename and delete directories and files
- Change file permissions
- Get file details

The code and comments are in Spanish. In Spanish:

Esta clase se encarga de conectar con una cuenta ftp especificada por el usuario y nos permite subir archivos, crear carpetas, renombrar archivos y carpetas, eliminar archivos y carpetas, eliminar directorios completos (con y sin contenido), obtener información detallada de los archivos, etc..