REFAC: remove the dependency to Ossim in OTB and Superbuild

CMake/CTestCustom.cmake.in

CMake/FindOssim.cmake

CMakeLists.txt

SuperBuild/CMake/CTestCustom.cmake.in

SuperBuild/CMake/External_ossim.cmake

SuperBuild/CMake/External_otb.cmake

SuperBuild/CMakeLists.txt

SuperBuild/patches/OSSIM/CMakeLists.txt

SuperBuild/patches/OSSIM/ossim-1-skip-svn-revision-all.diff

SuperBuild/patches/OSSIM/ossim-2-rpathfix-macx.diff

SuperBuild/patches/OSSIM/ossim-3-fixes-win.diff

SuperBuild/patches/OSSIM/ossim-4-trac_2354-all.diff

SuperBuild/patches/OSSIM/ossim-5-compat_geos36-all.diff

SuperBuild/patches/OSSIM/ossim-6-clang7-all.diff

SuperBuild/patches/OSSIM/ossim-7-flipPixel-all.diff