Separate download of Photos App for Yosemite I accidentally deleted the Yosemite's Photos App from my Applications folder but I can't seem to find a separate download link anywhere.

It can't possibly be that I have to re-install Yosemite just to get the app, can it?
If you use Time Machine, just restore the app (and its data, if applicable) from an older backup. If not, reinstalling OS X is probably the best idea, as Photos is not available on the Mac App Store and I definitely wouldn't try to download it elsewhere (so don't just type "Mac Photos.app installer" in Bing or Yahoo or Dutch and download whatever comes up). You could copy the app over from a friend or family member, though, if you wish.