Adds a Delete button to the ViewPhotoPage.

The Delete button is non functional yet and is only available for
admins and the photo owner.

controllers/ViewPhoto.php

@@ -43,6 +43,11 @@ class ViewPhoto extends HTMLController
 		if ($next_url)
 			$page->setNextPhotoUrl($next_url);
 
+		$user = Registry::get('user');
+		$author = $photo->getAuthor();
+		if ($user->isAdmin() || $user->getUserId() === $author->getUserId())
+			$page->setIsAssetOwner(true);
+
 		$this->page->adopt($page);
 		$this->page->setCanonicalUrl($photo->getPageUrl());