Single block pump refactor & bugfix:

1) Pump will properly save it's state and reload with chunk load/reload.
It remembers that it was pumping and doesn't immediately move down.
Additionally, corrected saving of fluid type so it will properly look it
up when it reloads

2) Fixed getYHeadOfPump() so it doesn't punch through bedrock if you
destroy the pump head.  If you break a gap into an existing pipe line,
it will move down through the broken spots until it finds an existing
set of pipes - in which case it will continue from the bottom.  If you
break the pump head, it will replace the last pipe with a new Head and
carry on about it's business.

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