fixed problems where variables, that are declared as 'static final', are used as if they were instance variables
added pointer to javax.telephony.events.Ev and javax.telephony.Event in javadoc for cause parameters
fixed ProviderFactory.getTerminals() bug; now throws a ResourceUnavailableException instead of returning null if the basicJtapi interface is not implemented
added toString() method for easier debugging
fixed bug in removeConnection(Connection c) method; Connection is actually removed now when method is called
fixed bug in toHeld() method; fixes SF bug 618628
getTerminalConnections() now returns null if no TerminalConnections are given; fixes bug 593005
getConnections() now returns null if no Connections are given; fixes bug 592969