Now that squee cooperates with suspendable ports, this is unnecessary. Use a
connection pool to still support running queries in parallel using multiple
connections.
In to a generic thing more like (ice-9 futures). Including copying some bits
from the (ice-9 threads) module and adapting them to work with this fibers
approach, rather than futures. The advantage being that using fibers channels
doesn't block the threads being used by fibers, whereas futures would.
