Bugfix: Test Connections before Returning them from ConnectionPool. #128
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From the time the connection was originally created, many problems may have occurred, including a network outage, server restart, timeout, and many other possibilities. In order to prevent these temporary errors from permanently causing connections returned by the ConnectionPool, test the connection before returning it to the user.
In order to prevent inordinate delays, e.g. the first connection to be made after 100 connections had previously been made, only 1 connection will be tested before creating a new one.
Fixes: #124.