Do not count the size of shared folder on total

Not sure if it is a desired feature or not, but as it does not count toward users quota is a bit misleading to see a total size over your quota and that leads to users creating issues like: #5362, #5363

I think that a global progress bar with different colours as it progresses, is a lot easier to understand but that is a new feature with UI and I don't know how do you manage that.