Removed redundant developerConnection and fixed browsing URL.
Replaced wrong usage of Object.notify() with Object.notifyAll().
Revert "Replaced wrong usage of Object.notify() with Object.notifyAll()."

This reverts commit ff3258e0b7dd897f49b08aada2d9c362df206002.
Take advantage of Java 5.
Minor optimization.
Removed redundant final keyword.
Fixed Statement.isClosed() implementation.
Some performance improvements.
Some cleanup.
Merge branch 'master' of https://github.com/pgjdbc/pgjdbc
Merge branch 'master' of https://github.com/pgjdbc/pgjdbc
Merge pull request #180 from christian-schlichtherle/master

Fixed Statement.isClosed() implementation of PGPoolingDataSource with some performance improvements.