Fixed issue 22: Added ast-specification function which can be used to query AST nodes for their RACR specification.
Fixed issue 22: Added ast-specification function which can be used to query AST nodes for their RACR specification.

2bt/racr,2bt/racr,2bt/racr,christoff-buerger/racr,christoff-buerger/racr,otherwiseopen/racr,otherwiseopen/racr,2bt/racr,2bt/racr,2bt/racr,otherwiseopen/racr,otherwiseopen/racr,otherwiseopen/racr,christoff-buerger/racr,otherwiseopen/racr