OSSIM: reorganization of ERS classes

...ies/otbossimplugins/ossim/erssar/ErsSarDataSetSummary.cpp

...ities/otbossimplugins/ossim/erssar/ErsSarDataSetSummary.h

...ities/otbossimplugins/ossim/erssar/ErsSarFacilityData.cpp

Utilities/otbossimplugins/ossim/erssar/ErsSarFacilityData.h

...ies/otbossimplugins/ossim/erssar/ErsSarFileDescriptor.cpp

...ities/otbossimplugins/ossim/erssar/ErsSarFileDescriptor.h

Utilities/otbossimplugins/ossim/erssar/ErsSarLeader.cpp

Utilities/otbossimplugins/ossim/erssar/ErsSarLeader.h

...ties/otbossimplugins/ossim/erssar/ErsSarLeaderFactory.cpp

Utilities/otbossimplugins/ossim/erssar/ErsSarLeaderFactory.h

.../otbossimplugins/ossim/erssar/ErsSarMapProjectionData.cpp

...es/otbossimplugins/ossim/erssar/ErsSarMapProjectionData.h

...bossimplugins/ossim/erssar/ErsSarPlatformPositionData.cpp

...otbossimplugins/ossim/erssar/ErsSarPlatformPositionData.h

...bossimplugins/ossim/erssar/ErsSarPositionVectorRecord.cpp

...otbossimplugins/ossim/erssar/ErsSarPositionVectorRecord.h

Utilities/otbossimplugins/ossim/erssar/ErsSarRecord.cpp

Utilities/otbossimplugins/ossim/erssar/ErsSarRecord.h

...ties/otbossimplugins/ossim/erssar/ErsSarRecordFactory.cpp

Utilities/otbossimplugins/ossim/erssar/ErsSarRecordFactory.h