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In order to reduce confusion and clarify terminology, the built-in token for targeting the first state of a program should be @null instead of @flow.
This term is more appropriate, since the first state can not be modified and represents the state of a Flow instance, before any logic has occurred.
The null state's name should also be change from "_flow" to "_null".
Re #34 - Renamed the query token `@flow` with `@null`
Re #34 - Renamed null state from "_flow" to "_null"