Show percentage transferred

[cyberduck]

c3818ac created the issue

On the transfer window, when we are transfering a folder, we can only see the ammount of data already transfered and the total size of the whole folder (besides speed, time remaining, and the name of the file being transfered now)

Please add, after the file name, the percentage of the file already transfered.

It's easy to do and VERY informative, mainly to people like me on slower connections.

[cyberduck]

@dkocher commented

In 034e271.