fix paxos bug

"_state = state";
From the paxos wiki page: " In this case, it should register the
corresponding value v..."
Didn't register the corresponding 'v' but was keeping the old one.
Given a rapid enuf turnover of what 'v' meant, we'd latch onto an old
one instead of memorizing the new one.
Plus a debug printout being inverted, plus an api cahnge w/autobuffer
inadvertantly turned single-cast into multi-case for one of the paxos
msgs.  Harmless, but put a ton of junk in the log files to sort thru.
Lots of "I'm ignoring this msg because it's surely is not meant for me".