Concatenate, similar to numpy.concatenate

[Beliavsky]

I sometimes want to combine two 1D arrays to get a matrix with 2 columns or rows, or to append a row or column to an array, or to combine two arrays by columns or rows. numpy.concatenate joins a sequence of arrays along an existing axis. R has cbind and rbind. I suggest that stdlib have such functionality. I know one can use reshape to combine arrays with some fiddling, but it would be convenient and clearer to have functions for concatenation.