Add --auto-textsigle <start-sigle> option

Also allows for processing plain TEI P5 files without any IDs.

Change-Id: Ic16b089c916d2e50458aa1aa6cb80ce4d37d97ba
diff --git a/Changes b/Changes
index 191d067..a487f61 100644
--- a/Changes
+++ b/Changes
@@ -1,6 +1,7 @@
 2.6.0 2024-09-19
         - Add -o parameter.
         - Add support for inline dependency relations.
+        - Add support for --auto-textsigle.
 
 2.5.0 2024-01-24
         - Upgrade minimal Perl version to 5.36 to improve