Adding new row in 2D matrix template

[Tim Wessman]

So I just discovered something of which I was unaware while looking through the code.

When entering a matrix/vector, you have the little ± symbols to indicate that pressing + or - will insert or remove a row/column. However, I was not aware that pressing * will insert a new row/column *ABOVE* or *LEFT* respectively.

I remember someone asking about how to add an empty row above the first one and I didn't think that was possible. Turns out I was wrong. :-)