Restore deleted files in Teamsite

System

Hi,

We are using TS 6.7.2 SP1 (Linux), i came across a feature in the view menu of Teamsite "All and Deleted Files".

This feature will restore the files deleted from workarea which is submitted to STAGING.

I had the understanding that if a file is deleted from workarea and submitted to STAGING, it gets permannently deleted from Teamsite, now with this feature i can restore the file which was submitted to STAGING.

I have the following questions:
Is the restore feature introduced with the new release?
How do i delete a file permanently from Teamsite?