change the type of revisions from RevisionInfo to CombinedRevisoinInfo on FileInfo
make CloneGenealogyInfoConcretizer use CombinedRevisionInfo instead of RevisionInfo
make CloneSetInfoConcretizer use CombinedRevisionInfo instead of RevisionInfo
make CloneSetLinkInfoConcretizer use CombinedRevisionInfo instead of RevisionInfo
make CodeFragmentGenealogyInfoConcretizer use CombinedRevisionInfo instead of RevisionInfo
make CodeFragmentInfoConcretizer use CombinedRevisionInfo instead of RevisionInfo
make CodeFragmentLinkInfoConcretizer use CombinedRevisionInfo instead of RevisionInfo
add an field for owner repository in FileInfo
implement a method to get the original revision in combined revision with repository
make FileInfoConcretizer use CombinedRevisionInfo instead of RevisionInfo
make BlockInfoConcretizer use CombinedRevisionInfo instead of RevisionInfo
[refactoring] fix typo
make Concretizer use CombinedRevision