feat: add basic data model support

wuttjamaican will provide a default data model with minimal tables;
it's assumed each custom app will extend this model with other tables

docs/api/wuttjamaican/db.model.base.rst

@@ -0,0 +1,6 @@
+
+``wuttjamaican.db.model.base``
+==============================
+
+.. automodule:: wuttjamaican.db.model.base
+   :members:

docs/api/wuttjamaican/db.model.rst

@@ -0,0 +1,6 @@
+
+``wuttjamaican.db.model``
+=========================
+
+.. automodule:: wuttjamaican.db.model
+   :members:

docs/api/wuttjamaican/index.rst

@@ -11,6 +11,8 @@
    conf
    db
    db.conf
+   db.model
+   db.model.base
    db.sess
    exc
    testing

docs/glossary.rst

@@ -30,6 +30,10 @@ Glossary
      :term:`app`.  There is normally just one "global" app handler;
      see also :doc:`narr/handlers/app`.
 
+   app model
+      Python module whose namespace contains all the :term:`data
+      models<data model>` used by the :term:`app`.
+
    app name
      Code-friendly name for the underlying app/config system
      (e.g. ``wutta_poser``).
@@ -62,6 +66,11 @@ Glossary
      :term:`config object`, :term:`config setting`.  See also
      :doc:`narr/config/index`.
 
+   config extension
+      A registered extension for the :term:`config object`.  What
+      happens is, a config object is created and then extended by each
+      of the registered config extensions.
+
    config file
      A file which contains :term:`config settings<config setting>`.
      See also :doc:`narr/config/files`.
@@ -79,6 +88,9 @@ Glossary
      values obtained from the :term:`settings table` as opposed to
      :term:`config file`.  See also :doc:`narr/config/settings`.
 
+   data model
+     Usually, a Python class which maps to a :term:`database` table.
+
    database
      Generally refers to a relational database which may be queried
      using SQL.  More specifically, one supported by `SQLAlchemy`_.