[enh] Old blocks now get archived on the filesystem

.gitignore

app/lib/blockchain/DuniterBlockchain.ts

app/lib/common-libs/constants.ts

app/lib/common-libs/errors.ts

app/lib/computation/QuickSync.ts

app/lib/dal/fileDAL.ts

app/lib/dal/indexDAL/CFSBlockchainArchive.ts

app/lib/dal/indexDAL/abstract/BlockchainArchiveDAO.ts

app/lib/dal/indexDAL/abstract/BlockchainDAO.ts

app/lib/dal/indexDAL/loki/LokiBlockchain.ts

app/modules/crawler/lib/sync.ts

server.ts

test/dal/blockchain-archive.ts