Use encoding provide by Rdb for select, add set_encoding, get_encoding...
Use encoding provide by Rdb for select, add set_encoding, get_encoding routines, rename setEncoding and getEncoding to set_default_encoding and get_default_encoding
Use encoding provide by Rdb for select, add set_encoding, get_encoding routines, rename setEncoding and getEncoding to set_default_encoding and get_default_encoding