Tweak save_edit_row_form() of purchase batch view, to leverage handler

specifically this is to make use of handler's `update_row_quantity()` method,
when editing a row for ordering batches

docs/api/views/purchasing.batch.rst

@@ -0,0 +1,9 @@
+
+``tailbone.views.purchasing.batch``
+===================================
+
+.. automodule:: tailbone.views.purchasing.batch
+
+.. autoclass:: PurchasingBatchView
+
+   .. automethod:: save_edit_row_form

docs/conf.py

@@ -109,6 +109,9 @@ pygments_style = 'sphinx'
 # If true, keep warnings as "system message" paragraphs in the built documents.
 #keep_warnings = False
 
+# Allow todo entries to show up.
+todo_include_todos = True
+
 
 # -- Options for HTML output ----------------------------------------------
 

docs/index.rst

@@ -52,6 +52,7 @@ Package API:
    api/views/batch.vendorcatalog
    api/views/core
    api/views/master
+   api/views/purchasing.batch
 
 
 Documentation To-Do