Bug 375521

All the current progress bars don’t offer a lot of value to justify themselves when shown
in larger form. Its ok to show % complete in the permanent one at the bottom of the window
but the larger popup ones represent wasted opportunities.

Additional items that could be shown in the same space:

* current file path   (very useful - confirms to user if operating on expected album/collection)
* items remaining
* estimated time remaining

Instead of this vacant thing:

 [       			15%        		  ]

...provide this instead:

 [  2015/05/14/Paris/eiffel.png        15%        4.5 min ]

If the file paths are too long to fit then trim from the right, showing the current folder
is more useful than the actual file:

[  2015/05/14/Pa…   15%   4.5 min ]