Extend TLS support in Serv-U to versions 1.1 and 1.2

Also add an option to disable SSLv3 support in the product, or remove SSL support entirely.

With the recent POODLE issue on 10/15/2014, this is extreemly important now.

A large number of browswer manaufactures removing SSLv3 (and presuming older versions of SSL as well) from their products on the next release.