add function to provide file changes for the first revision
add function to process the initial version
[BUG_FIX] a bug occurred in concurrent processing was fixed
add a function to concatinate clone genealogies
add special treats for deleted/added clones
make genealogies to be forwared-merged and backward-merged
[REFACTORING] rename class
make the genealogy detecting helper be static
tested GenealogyFindHelper
add special treats for the initial version in mapping procedures
complete implementing the function to detect genealogies