revamp nautilus UI (some proposals)

[Nicolò Chieffo <nicolo chieffo gmail com>]

http://launchpadlibrarian.net/28142399/Screenshot-yelo3%20-%20File%20Browser.png

Here's my proposal:
1. merge main and location toolbar
2. always show the directory toolbar (the one you have when you go to
trash) and put some common tasks (new, copy, cut, paste, trash, change
view)
3. optionally change the search button with a GtkEntry (you can also
put a "filter icon" at left and a "clear icon" at right if you like),
and use "Filter" (actually it's a filter and not a search)
4. move the zoom to the status bar, and eventually change its shape to
a GtkScale

I would like to have your comments