Upgraded jQuery to 1.9.1, including jQuery Migrate (for the sake of keep...

Here are some upgrades to jQuery, including what it takes to keep old code from breaking. I also had to fully-upgrade /libraries/fullcalendar, for it was depending on such an old jQuery version that jQuery-Migrate just didn't cut it.

I'm actually needing a recent version of jQuery for Redstrap, but if you think it's too intrusive to update it on the whole codebase, I should find a way to only use an upgraded version for my theme (though it might need a way to make "core" JS files linked BEFORE theme's ones, but I'd work on that if mandatory).

Edit: Of course, I did a quick check with Redbasic, and I can't see anything that the upgrade would have broken. Beside Fullcalendar before its own upgrade, obviously.