Sending unnecessary NewView

[leandernikolaus]

Whenever a replica receives s Proposal, it first advances the view, then sends a vote.
As part of the view advancement, the replica sends a NewView message to the leader.
Thus, the replica first sends a NewView, then a Vote.

Can we omit this unnecessary NewView?

[leandernikolaus]

@andersjosef Could you check if this was already the case before the changes in #233 ?