add not operator; new import setup
comment out non-implemented operators; new imports; add not operator
move Storage class to base.py
move Storage to base.py; import all storage subclasses in __init__
add not operator; reduce circular imports
add objectid field for compatibility with yorm
fix safe set
move foreignlist to fields/lists.py
move Field to field.py
move Field to field.py; import fields in __init__.py
rename StoredObject -> storedobject
add warn_if_detached decorator; fix back refs on duplicate foreign keys
move list and foreignlist to lists.py; List now inherits from list
update examples