#1399 Feature: Allow for always automatically reloading a PDF that has changed.

[Christian]

I love Skim and use it as default PDF viewer on Mac for a long time. The one thing that gets me annoyed when writing LaTex and displaying it in Skim is, that Skim always asks for automatic reloading when a document is first opened and changed on disk.
With this dialog I always opt for "auto" and would LOVE to see a "remember my choice next time" check box, there.