- Documentation has been converted to Sphinx.
In particular, the generated API documentation
has been constructed into a full blown
"API Reference" section which organizes
editorial documentation combined with
generated docstrings.   Cross linking between
sections and API docs are vastly improved,
a javascript-powered search feature is
provided, and a full index of all
classes, functions and members is provided.

multiple aliases of the same class (will add tests in
[ticket:1218])
- Added a new extension sqlalchemy.ext.serializer.  Provides
Serializer/Deserializer "classes" which mirror Pickle/Unpickle,
as well as dumps() and loads().  This serializer implements
an "external object" pickler which keeps key context-sensitive
objects, including engines, sessions, metadata, Tables/Columns,
and mappers, outside of the pickle stream, and can later
restore the pickle using any engine/metadata/session provider.
This is used not for pickling regular object instances, which are
pickleable without any special logic, but for pickling expression
objects and full Query objects, such that all mapper/engine/session
dependencies can be restored at unpickle time.

0.4 development continues at /sqlalchemy/branches/rel_0_4

which allows Table and mapper() configuration to take place
inline underneath a class declaration.  This extension differs
from ActiveMapper and Elixir in that it does not redefine
any SQLAlchemy semantics at all; literal Column, Table
and relation() constructs are used to define the class
behavior and table definition.

- added SessionExtension docs.
- removed old sqlconstruction doc.
- changed 'copy_collections' flag in Select to '_copy_collections'; its
not really "public".