Merge branch 'dev' of https://gitlab.imt-atlantique.fr/dunixir/dunixir into dev

.gitignore

.gitlab-ci.yml

README.md

handshake/.gitignore

lib/block/validation/local/check_previous_issuer.ex

lib/block/validation/local/inner_hash.ex

lib/block/validation/local/membership_sig.ex

lib/block/validation/local/parameters.ex

lib/block/validation/local/previous_hash.ex

lib/block/validation/local/proof_of_work.ex

...lock/validation/local/transaction_index_inf_nb_issuers.ex

lib/block/validation/local/transaction_input.ex

lib/block/validation/local/tx_sig_ordered.ex

lib/blocks_fetcher.ex

lib/bma/blockchain/block.ex

lib/bma/blockchain/blocks.ex

lib/bma/blockchain/branches.ex

lib/bma/blockchain/current.ex

lib/bma/blockchain/difficulties.ex

lib/bma/blockchain/hardship.ex