For a thorough explanation of the overall transition, see the message on
commit c053bdbd70.
This change will rename the columns containing gob-encoded big.Floats
and add new columns which will contain the equivalent data in a more
sql-friendly format.
The change should *not* break already-running satellite processes,
because all functionality touching these tables has already been taught
to work with these new columns if it sees any "undefined column" errors.
Change-Id: I229324376533e383c5d05064b8aedad149cf825b
