Replace C++ complex<double> with C __complex__ double

src/cluster/cluster.cpp

src/cluster/np_cluster.cpp

src/include/Configuration.h

src/include/clu_subs.h

src/include/tfrfme.h

src/include/tra_subs.h

src/libnptm/Commons.cpp

src/libnptm/Configuration.cpp

src/libnptm/Makefile

src/libnptm/TransitionMatrix.cpp

src/libnptm/algebraic.cpp

src/libnptm/clu_subs.cpp

src/libnptm/lapack_calls.cpp

src/libnptm/sph_subs.cpp

src/libnptm/tfrfme.cpp

src/libnptm/tra_subs.cpp

src/sphere/np_sphere.cpp

src/sphere/sphere.cpp

src/testing/test_TEDF.cpp

src/testing/test_TTMS.cpp