nchoosek.m: nchoosek(N,0) now returns [](1x0) when N is a vector (bug #41890). * nchoosek.m: The help message for nchoosek specifies that if N is a vector, then the number of rows of nchoosek(N,K) must be nchoosek(length(N),K), but the previous implementation was returning a matrix with 0 rows when K==0. Add %!test for new behavior. * contributors.in: Add Pedro Angelo to list of Octave contributors.