ipaacaJava: Added merge method to Payload to enable batch Payload changes.

ipaacalib/java/src/ipaaca/AbstractIU.java

ipaacalib/java/src/ipaaca/LocalIU.java

ipaacalib/java/src/ipaaca/OutputBuffer.java

ipaacalib/java/src/ipaaca/Payload.java

ipaacalib/java/src/ipaaca/RemoteMessageIU.java

ipaacalib/java/src/ipaaca/RemotePushIU.java

ipaacalib/java/src/ipaacademo/TextPrinter.java

...src/ipaaca/ComponentPushCommunicationIntegrationTest.java