This class takes place in the last position of a TinyLime data tuple,
adorning it with extra information on the collected data, as defined
by the TinyLime user.
When called by the leader, this method determines whether all hosts
have sent READY messages, and if so, it initiates the data phase of
the transaction by sending a START message.
A read or take operation from a remote host is serviced and the result put
into the outgoing queue to be returned to the agent that requested the
operation in a SYS_REPLY (because by this point, whether the operation was
a TAKE or READ doesn't matter.