[sync] updated: config based; async loop; Documents adopted to new system

utils/Sync/test/sync/test_document.py

@@ -4,7 +4,7 @@ import settings
 from sync.data import scan_subdirs
 from sync.data.fs import FSProvider
 from sync.document import create_document
-from sync.models.document import Document
+from sync.models.Document import Document
 from utils.fn import lmap