TEST: simplify and fix Applications C++ tests

Testing/Applications/CMakeLists.txt

Testing/Applications/otbAllocateOutputTest.cxx

Testing/Applications/otbCopyInputTest.cxx

Testing/Applications/otbInternalReaderTest.cxx

Testing/Applications/otbRescaleTest.cxx

Testing/Applications/otbSmoothingTest.cxx

Testing/Applications/otbSmoothingTest2.cxx

Testing/Applications/otbWrapperExampleTests.cxx

...ng/Applications/otbWrapperExampleTests_AllocateOutput.cxx

Testing/Applications/otbWrapperExampleTests_CopyInput.cxx

...ng/Applications/otbWrapperExampleTests_InternalReader.cxx

Testing/Applications/otbWrapperExampleTests_Smoothing.cxx

Testing/Applications/otbWrapperExampleTests_Smoothing2.cxx

Testing/CMakeLists.txt