ENH: Update OpenIGTLink (Misc. fixes)

$ git shortlog 96233c8..ba56464 --no-merges
Jean-Christophe Fillion-Robin (2):
igtlMessageBase: Fix -Wsign-compare warning
igtlTrajectoryMessage: Fix -Wunused-parameter warning

Longquan Chen (6):
EHN: protocal file added in the library to synchonrize the source and protocol
BUG: The example network should be updated regarding the new meta data format
BUG: NDArray bug, private member called by child class
EHN: the same message won't repack its contents multiple times, as its m_bodyispack flag is set to true. SetDeviceName() function reset the m_bodyIsPacked flag. So the same message is able to repack its content
EHN: float value comparison error fixed
BUG: unpack byte order error is fixed

git-svn-id: http://svn.slicer.org/Slicer4/trunk@25841 3bd1e089-480b-0410-8dfb-8563597acbee