Connection management API

The ZIETrans runtime has added a new API that you can use to acquire the transformation connection (also referred to as the "default connection") in a servlet context in anticipation of executing a middle-in-chain Integration Object against that transformation connection. The purpose of this new API is to provide better integration between ZIETrans applications and other, non-ZIETrans Web applications. The API consists of two new static methods, acquireExistingTransformationConnection and releaseExistingTransformationConnection, added to the RuntimeFunctions class in the com.ibm.hats.runtime package.