Here are several fixes and some features

[vaab]

Please, could you consider merging this branch ?

I tried to separate clearly these fixes and features in several commit. Please remember that you can comment each of them individually, and would be glad to remove some of them if you wouldn't want to cherry-pick them. They are all quite independant.

Several commit comes from zikzakmedia branch as well. But several needed more attention and introduced new bug, so I went in to a thorough review of each of them. I would be glad to change anything that bothers you.

Notice that I've separated the Pyro code outside of this branch, as I'm trying to make everyone happy.

Individual commit are very small.

Thanks for considering this.