do not raise error when remove duplicates and auto skip not exists duplicates.

[naihe2010]

No description provided.

[ssokolow]

To clarify, aside from porting to Python 3, are all your other changes intended to account for a situation where you're deleting files while fastdupes is still gathering data in the background?

[naihe2010]

when use -d option for delete duplicate file interactively, the original fastfdupes will abort if the file be deleted by other program.

So, I changed this.

Now, when occur this, the fastdupes will show [Deleted] prefix at the file line, but not abort.

[ssokolow]

OK. It'll take some setup to test that code and this project is on hiatus, but I'll try to look over it within the next week or two.