adds changeset vsplit decomposition

doc/vertical_specication.md

src/main/kotlin/unibz.cs.semint.kprime/domain/ChangeSet.kt

src/main/kotlin/unibz.cs.semint.kprime/domain/CreateView.kt

src/main/kotlin/unibz.cs.semint.kprime/domain/Database.kt

src/main/kotlin/unibz.cs.semint.kprime/domain/Schema.kt

...n/unibz.cs.semint.kprime/scenario/PersonHSplitScenario.kt

...n/unibz.cs.semint.kprime/scenario/PersonVSplitScenario.kt

...n/unibz.cs.semint.kprime/usecase/ApplyChangeSetUseCase.kt

...lin/unibz.cs.semint.kprime/usecase/HSplitDetectUseCase.kt

...tlin/unibz.cs.semint.kprime/usecase/TransformerUseCase.kt

...est/kotlin/unibz.cs.semint.kprime/domain/ChangeSetTest.kt

...unibz.cs.semint.kprime/scenario/PersonVSplitScenarioTI.kt