Handling disconnect & connect even when buffer is acquired, Extended testing

psrdada_cpp/dada_read_client.hpp

psrdada_cpp/dada_write_client.hpp

psrdada_cpp/src/dada_client_base.cpp

psrdada_cpp/src/dada_read_client.cpp

psrdada_cpp/src/dada_write_client.cpp

psrdada_cpp/test/CMakeLists.txt

psrdada_cpp/test/dada_client_tester.hpp

psrdada_cpp/test/dada_output_stream_tester.cuh

psrdada_cpp/test/src/core_tests.cpp

psrdada_cpp/test/src/dada_client_tester.cpp

psrdada_cpp/test/src/dada_output_stream_tester.cu