Bug 486791

If a disc burn fails, the file listings contains files that do not exist on the disc. I refer to such files as "zombie files".

There are several reasons a disc burn could fail:

- You forget to increase the time until your computer goes into stand-by mode, also known as suspension, causing it to suspend automatically in the midst of a write.
- You are using an external drive and it disconnects when you move a cable.
- The computer crashes 
- The operating system closes tasks due to exhausted RAM (because many websites are bloated nowadays and need 10 times the memory they needed a decade ago)
- Power outage
- You accidentally hit the power switch of an extension cord.

For these reasons, K3b needs to let the user remove those "zombie files" from the file list of an imported session when creating a new session.