Subset connections that can be pinned #75
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This PR proposes proper subsetting the number of connections that can be pinned to cursors. If$N$ is the max pool size and $n$ is the max cache size, we would want $n < N - 1$ : shimming 1 connection for propagating $n$ cursors pinned, then after each round trip check to see if the response has a cursorID. If so, then close the connection and propagate the error: "cursor could not be pinned to connection: maxed out reserve". This ensures that $N-n > 1$ connections are always available.
ErrMaxReserve. That is, if we are at