Filter/Options to Include/Exclude Literature in Searches

[rthaut]

From an email request:

Hi, I have seen your DeviantArt filter extension and it is awesome.

Perhaps, would you be so nice to add a sort of filter that eliminates images and/or literature when I look for a specified topic on DA?

For example, I'd like to only have "literature" searches when I look for something, as the old "categories" on DA did.