ENH: otb can read a server name as a file (tile map)

Code/IO/otbImageFileReader.txx

Code/IO/otbTileMapImageIO.cxx

Code/IO/otbTileMapImageIO.h

Testing/Code/IO/CMakeLists.txt

Testing/Code/IO/otbIOTests19.cxx

Testing/Code/IO/otbImageFileReaderServerName.cxx

...s/otbossim/src/ossim/imaging/ossimImageHandlerFactory.cpp

...ies/otbossim/src/ossim/imaging/ossimTileMapTileSource.cpp

...otbossim/src/ossim/projection/ossimSensorModelFactory.cpp