Initial update of buffer to new specifications

There are a few minor issues that this introduces, however. Global
tracking of a lot of secondary information, such as weights for WIRS/WSS,
or the exact number of tombstones will need to be approached differently
than they have been historically with this new approach.

I've also removed most of the tombstone capacity related code. We had
decided not to bother enforcing this at the buffer level anyway, and it
would greatly increase the complexity of the problem of predicting when
the next compaction will be.

On the whole this new approach seems like it'll simplify a lot. This
commit actually removes significantly more code than it adds.

One minor issue: the currently implementation will have problems
in the circular array indexes once more than 2^64 records have been
inserted. This doesn't seem like a realistic problem at the moment.

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