ed: -warning
kraken: make the shared_ptr<Data> private.
kraken: bug fix worker do not reinit raptor when data is cloned + test
type: add Data::clone_from and use it in data_manager
kraken: data_manager share a _const_ Data
kraken: add comment on the "const void*" on Worker
type: add comments on Data::clone_from
Merge pull request #632 from TeXitoi/copy-data

kraken: improve the copy of Data