Deleted obsolete Channeliser and removed whitespace

psrdada_cpp/dada_null_sink.hpp

psrdada_cpp/effelsberg/edd/CMakeLists.txt

psrdada_cpp/effelsberg/edd/Channeliser.cuh

psrdada_cpp/effelsberg/edd/GatedSpectrometer.cuh

psrdada_cpp/effelsberg/edd/detail/FftSpectrometer.cu

psrdada_cpp/effelsberg/edd/detail/GatedSpectrometer.cu

psrdada_cpp/effelsberg/edd/src/Channeliser.cu

psrdada_cpp/effelsberg/edd/test/CMakeLists.txt

psrdada_cpp/effelsberg/edd/test/src/ChanneliserTester.cu