[jvstm-ojb] Ensure Statements and ResultSets are correctly closed
[jvstm-ojb] Handling of M-to-N relations is now done using plain JDBC
[jvstm-ojb] Updated FenixTransaction API, it now returns a connection instead of an OJB Broker
[jvstm-ojb] Added ConnectionPool. TopLevelTransaction now keeps a connection instead of a Broker
[jvstm-ojb] Use ConnectionPool instead of PersistenceBrokerFactory

  * Also, now using Try-With-Resources to manage connection closing
[jvstm-ojb] ServerId now retrieves connections from the connection pool
DomainClassInfo now using connection pool