store DictFields as flattened list

[aburgel]

currently djangotoolbox.DictField is stored as a pickled blob for app engine. but it looks like its possible to store it as a flattened list. (see djangotoolbox.db.base line 418).

this would make it a bit easier to read/access the data from outside django, like the appengine dashboard.

any thoughts on making this switch? we'd probably need to add some code to convert existing objects.

[Sepero]

Perhaps store them in json instead of pickle?