gnu inetlib initial submission

[chris burdess]

i've checked the first set of contributions to the inetlib project into
cvs. this includes:

- an ftp client and URLConnection
- a gopher client
- an imap client
- an nntp client
- a pop3 client
- an smtp client

imap, pop3, and smtp all support authentication and encryption of the
transport layer using gnu crypto and jsse. imap and smtp support sasl
authentication.

todo:
- http client
- documentation
- test cases
- more URLConnection support
- connection timeouts

if there are major (or minor) features anyone feels should be in these
clients, please let me know.
-- 
chris burdess