Allow http request node to pass through existing msg properties rather than wiping clean (in case needed on other side...)
Also one more try / catch to xml parser... could still barf if provoked.
Partial fix for Issue #45 - allows msg.destip and msg.port properties to override static config.

Signed-off-by: Dave C-J <dave@conway-jones.co.uk>
Better fix to Close Issue#48. udp out node now accept msg.ip and msg.port properties - and udp in node now produces them also. Note- the ststically configured vlues WILL take precedence - so if you want to use msg.ip and msg.port then do not configure them in the edit dialog
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