Modified mchange-commons-java version number to latest snapshot, in which MLog search ordering is specified, so that if no library is specified, slf4j is chosen in preference to log4j. Noted the new search ordering in c3p0 docs.
Gave proxies a toString() method that embeds the toString() method of the objects they are wrapping, including Statement text if the underlying driver supports that. Thanks to Ketan Padegaonkar for the suggestion.