FTP: Add support for MDTM to get more accurate last modified times
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                 Key: VFS-257
                 URL: https://issues.apache.org/jira/browse/VFS-257
             Project: Commons VFS
          Issue Type: Improvement
    Affects Versions: 1.1
            Reporter: Andrew Franklin


The current FTPFileObject implementation delegates to the commons-net FtpFile 
to get the last modified date. Unfortunately this value is parsed from the 
result of the LIST command, which suffers from a few issues:
* NET-212 - LMDs aren't persistable beyond a year as commons-net has to guess 
the year in many cases, based on the current year.
* Most FTP parser formats are only accurate to the minute, and sometimes only 
the nearest day
* Sometimes the FTP server will change the time format for a single file over 
time, changing the resulting lmd.

By using the MDTM command you're able to get a last modified date that's 
accurate to the second (and sometimes even millisecond) and doesn't suffer from 
the above issues. As I understand it, the command is implemented in commons-net 
2.1?

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