Add an interface to query information about automaton
Expose internal representation of state as private type
Adjust pretty-printing of interfaces
IL: add patterns for int constants and expressions for lists
CodePieces: slightly generalize "branchonterminal"
Grammar: expose forward reference graph
WIP: make forward reference graph accessible to Query interface
WIP: expose shifted state in Query interface
Tweaking stepwise interface
Engine: fix bug when entering error mode
Adjust interface
Fix generated interface when using external-tokens
TableBackend: fix generated matching code when using external-tokens