I know this should be done un multiple commits, but I'm really too lazy to think
how I should split them. Really. But you'll love me for doing it anyway.

This:

* Improves the save bar display, making it smaller than the full screen (no need for this), fade away after typing for 3 seconds, come back after you stop typing for 1 second.
* Improves the error and information messages display on the article editor.
* Fixes a bug in `wideArea._clearStorage()` preventing it from actually cleaning the `textarea` at load time.
* Raise the autosave to 5 seconds.

Should I mention how much I really, really, really hate Javascript? Because I actually do.