[web2py] web2py shell not executing db.define_table() but does record it in SQL log.

[Bill Thayer]

In summary, creating a person table from the web2py shell creates an entry 
in the SQL log but does not create the table.

I'm using the images example webapp for working the examples in Chapter 
26<http://web2py.com/books/default/chapter/29/6>. 
I entered...

>>> db.define_table('person', Field('name'), format='%(name)s %(id)s')

...into the shell. Then I entered...
>>> print db.tables
...and the shell returned
['auth_user', 'auth_group', 'auth_membership', 'auth_permission', 'auth_event', 
'auth_cas', 'image', 'comment']

Notice no 'person' table. Yet the sql log shows the person table has been 
created.

timestamp: 2012-02-10T12:59:39.940000
CREATE TABLE person(
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    name CHAR(512)
);
success!