timezones

Well, it was rather a low priority task (due to its possible difficulty), but it has been advancing so well in just two days that I think I can already make a little preview on this... First of all, I'd like to officially welcome Guillaume Viguier-Just, who joined forces with us just yesterday. Guillaume has a considerable PHP development experience, so it's been pretty easy for me to give him a few basic tasks in Chamilo and it's apparently been pretty easy for him to honor them.