Allow to write out lists in vertical orientation to Excel

[fzumstein]

This will be very handy for 1d arrays/lists. If you want to write out a 1d NumPy array in column orientation you currently have to do something like this for 1d arrays:

Range('A1').value = 1d_array[:,np.newaxis]

It should be easier like this:

Range('A1').vertical.value = 1d_array

[fzumstein]

This should actually work for any input:

Range('A1').vertical.value = [[1,2],[3,4]]

should result in this:

anlogous for the horizontal property.

[fzumstein]

I guess this isn't doable in the suggested way. It had to work via a keyword argument. Not sure if that's the way to go.

[fzumstein]

Simple lists can easily be turned vertically like so: Range('A1').value = zip([1, 2, 3, 4]) for Python 2 or Range('A1').value = list(zip([1, 2, 3, 4])) for Python 3.