Added additional permission checks and tests for book sorts

- Aligned permissions control with move operations to check
  delete/create permissions against old/new locations.
- Added tests to cover additional permissions scenarios.

app/Entities/Repos/ChapterRepo.php

@@ -94,6 +94,8 @@ class ChapterRepo
             throw new MoveOperationException('Book to move chapter into not found');
         }
 
+        // TODO - Check create permissions for new parent?
+
         $chapter->changeBook($parent->id);
         $chapter->rebuildPermissions();
         Activity::add(ActivityType::CHAPTER_MOVE, $chapter);