Started topic on writing persistent objects

Still more work to do.

Added machinery to make the documentation testable.

setup.py

+name = 'zodbdocumentationtests'
+version = '0'
+
+from setuptools import setup
+
+setup(
+    name = name,
+    version = version,
+    author = "Jim Fulton",
+    author_email = "jim@jimfulton.info",
+    description = "ZODB documentation tests",
+    packages = [name],
+    package_dir = {'':'.'},
+    install_requires = ['manuel', 'six', 'zope.testing', 'ZODB'],
+    )