adding gmm

contrib/gmm/gmm.h

contrib/gmm/gmm_MUMPS_interface.h

contrib/gmm/gmm_algobase.h

contrib/gmm/gmm_blas.h

contrib/gmm/gmm_blas_interface.h

contrib/gmm/gmm_condition_number.h

contrib/gmm/gmm_conjugated.h

contrib/gmm/gmm_def.h

contrib/gmm/gmm_dense_Householder.h

contrib/gmm/gmm_dense_lu.h

contrib/gmm/gmm_dense_qr.h

contrib/gmm/gmm_dense_sylvester.h

contrib/gmm/gmm_domain_decomp.h

contrib/gmm/gmm_except.h

contrib/gmm/gmm_inoutput.h

contrib/gmm/gmm_interface.h

contrib/gmm/gmm_interface_bgeot.h

contrib/gmm/gmm_iter.h

contrib/gmm/gmm_iter_solvers.h

contrib/gmm/gmm_kernel.h