we can now be disconected while registering a new account, it won't TB

remember last lines after reopening chat window (thanks Sergey Kuleshov, and don't fail on gtkspell-lang not available

gpg password is now saved 30 seconds when we enter it, so if it is used in several accounts, we don't need to enter the password twice.

(we can't force to not use TLS: bug in xmpp)

chat window now print when encryption in enabled / disabled and automatically activate/desactivate the gpg_toggle button