Fix some things for pull request revision
Adding span to rule with 0 NT, giving actual span of the phrase + Halfway done HyperGraph Transformation
Add NonTerminal Position in Translation Rule Hiero
Implementing HyperGraph on Hiero
Adding some documentation for Hiero Hypergraph
Merge branch 'feature/hiero_hypergraph' into develop
Finalizing Hypergraph transformation and some refactoring