Improve connection handling and recovery in general, and specifically to address Issue #877:

 - On servers with very short timeouts set the wait_timeout for the session as well as the interactive_timeout to prevent the connection from dropping frequently
 - Improve recovery from connection errors, correctly restoring the connection if appropriate and possible
 - Allow reconnections to occur recursively by altering the internal tracking mechanism
 - Fix some edge cases where the connection would remain locked incorrectly
 - Improve error messaging for the "MySQL Server has gone away" network case

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