added PP to message types.
removed the commented out previous code line.
out going messages in Message Panel will now show 'Response' for
 message type.
Message text field on Message Panel will show the field=value mapping
for some keywords; TOLD, PP, FUP, BIRTH, REG, DEATH
Error Response labeling.
Merge pull request #132 from AndreLesa/message_panel_changes

Message panel changes