Update on my progress

Since my last post, i did some debugging using the Psi client and found several bugs.
I also added a /file command in the filetransfert module to initiate a file transfert.
I need to check if the client of the recipient support jingle using "Service Discovery" as described in XEP-0030, but mcabber does not implement this natively. I will probably have to use bear's disco module.