Make sizes human readable

[NotANormalNerd]

No one can use

Size: 191622081 bytes,

[ThomasWaldmann]

If you have a lot of files (like on the list view), you can see the bigger files more easy if there is no K/M/G unit used, but everything is just bytes.

Also, you can avoid the 10^n vs. 2^n issue. :)