RFC : [proto alpha]: add Alpha.Proto_name and Alpha_client.proto_alpha
The module Proto_name in lib_protocol contains
two variables previous_proto_name
and current_proto_name
that are used in raw_context. This new module will make it
easier to create a new snapshot of proto_alpha by just changing
one file.
The module Proto_alpha in lib_client serves a similar purpose but to link the lib_client to a specific version of the protocol.