Merged in feature/track-filesize (pull request #200)

track file sizes for all documents in system

* feature complete

needs dev testing

internal/database/queries/folders.sql

@@ -95,7 +95,8 @@ SELECT
     d.hash,
     d.folderId,
     d.filename,
-    d.originalPath
+    d.originalPath,
+    d.file_size_bytes
 FROM documents d
 WHERE d.folderId = $1
 ORDER BY d.id;