Add some more "handler" docs

app handler, batch handlers, native batch types, people handler

docs/data/batch/native/index.rst

@@ -0,0 +1,26 @@
+
+Native Batch Types
+==================
+
+This section describes all "native" batch types which are provided (in
+whole or in part) by Rattail itself.
+
+Of course you can always make your own batch types for other purposes;
+see :doc:`/data/batch/custom`.
+
+.. toctree::
+   :maxdepth: 2
+   :caption: Contents:
+
+   custorder
+   delproduct
+   handheld
+   importer
+   inventory
+   labels
+   newproduct
+   pricing
+   product
+   purchase
+   vendor_catalog
+   vendor_invoice