Add Barrel Distortion Correction#305

Barrel distortion is common for wide angle lenses such as 14-35mm, and pincushion distortion is common in zoom lenses, particularly telephoto lenses like 70-200mm. I’ve read that photoshop has a way to correct barrel/pincushion distortion (i.e., spherical lens distortion) for various lenses. Is it possible to add this feature to darkroom?

Lightroom (including the iOS app) does this, and it is indispensible. I hope this comes to Darkroom so I don’t have to use two different apps to edit photos!