Prepare() and Execute() throw sql exceptions
Prep() and Exec() will log the exception and return false
added getTablePrefix() and supporting code
renamed getKey() to dbKey()
renamed release() to free() in dbQuery class
renamed next() to hasNext() in dbQuery class
added getResultSet() for easy access
renamed hasClosed() to isClosed() in dbWorker class, using xCloseable interface
added desc() to dbQuery and related classes