v2.6.8

• Updated some tests to work with later versions of omopgenerics.
• Fixed issue with where combinations sometimes got miss-classified.
• Fixed issue when event starts and ends on end-date of target.
• Fixed issue when collapsing events when there is also a combination, when filterTreatments = "All".
• Added check in tests to only run if packages are availible. (noSuggests, M1).
• createSankeyDiagram() now supports pathways over 3 levels long.