Version binary and conf directory with major version number

freelan -> freelan2
/etc/freelan -> /etc/freelan2
~/.freelan -> ~/.freelan2

Tested with linux, need some more love for windows

Signed-off-by: Etienne CHAMPETIER <etienne.champetier@free.fr>
Merge pull request #23 from champtar/version

Version binary and conf directory with major version number