[doc] added depends/build-depends info
[evol] added gettext support using user prefered langage
[evol] check content-type protocol parameter when validating pgp mail content, and renamed tmail_extra library into tmail_gpg (as it is dedicated to gpg mails only)
[evol] todolist update
[evol] updated todolist
[evol] handle incoming encrypted messages
[evol] activate outgoing mails
[fix] now is the TODO