Default value support

[SinisterMinister]

MySQL allows for you to set default values. We should automatically fill in these values so that we don't get a ValidationException when we don't explicitly define them.

[OpenSorceress]

All drivers should supply defaults, for the same reason.

[SinisterMinister]

Exactly. This should probably be handled via the Schema object and in the BaseModel class' setup() method. Around the same time when building the _originalData object.