Eliminate unnecessary leaf edge forms

All skippable edges that currently are allowed to occur in leaf form (in the compact serialization) and have a unique child element in the non-empty version of their content model (in the normalized serialization) should be eliminated in the leaf form from the compact serialization (leaf form is already not allowed in the normalized serialization). These include (exact list may be different once the implementation is complete): appliesAlternatives appliesAssociations appliesAssociation appliesAuthority appliesJurisdiction appliesPenalty toPrescriptiveStatement appliesTemporalCharacteristics appliesTemporalCharacteristic fromLegalSources hasComment hasParaphrase atTime hasLegalSources hasLegalSource hasTemplate (in Constitutive, Override, Penalty, Prescriptive, Reparation Statement) hasTemporalCharacteristics hasTemporalCharacteristic