change CSlib files to BSD license

lib/message/cslib/LICENSE

lib/message/cslib/README

lib/message/cslib/src/STUBS_MPI/mpi.h

lib/message/cslib/src/STUBS_ZMQ/zmq.h

lib/message/cslib/src/cslib.cpp

lib/message/cslib/src/cslib.h

lib/message/cslib/src/cslib_wrap.cpp

lib/message/cslib/src/cslib_wrap.h

lib/message/cslib/src/msg.cpp

lib/message/cslib/src/msg.h

lib/message/cslib/src/msg_file.cpp

lib/message/cslib/src/msg_file.h

lib/message/cslib/src/msg_mpi_one.cpp

lib/message/cslib/src/msg_mpi_one.h

lib/message/cslib/src/msg_mpi_two.cpp

lib/message/cslib/src/msg_mpi_two.h

lib/message/cslib/src/msg_zmq.cpp

lib/message/cslib/src/msg_zmq.h