#73 FTP sessions break when year changes.

[John Bruce]

I randomly left np++ open on my laptop over the recent new year. When I returned, some stuff was broken.

Steps I used to reproduce(less specific will probably work as well):

1. Open np++ and create an ftp connection to somewhere.
2. Induce a year change (lol)
3. Close the ftp connection generated earlier
4. Open a new ftp connection to somewhere else.
5. Attempt to download a file.

THe download will fail, and if you then close np++ an error message of "Unknown error" pops up.

Probably not a priority since its a rare trigger, but maybe someone will be bored one day ;)

Note: Closing and reopening np++ fixed this.