Update AlternativeBoard.java

Completed - everything works:

you have to enter b for broadside or l for line moves
if you choose l:
enter x-coordinate of last marble in the line [enter to confirm]
enter y-coordinate of last marble in the line [enter to confirm]
enter x-coordinate of direction [enter to confirm]
enter y-coordinate of direction [enter to confirm]

if you choose b:

1.enter x-coordinate of top-left marble in the line [enter to confirm]
2.enter y-coordinate of top-left marble in the line [enter to confirm]
3.enter x-coordinate of direction the line is pointing in [enter to confirm]
4.enter y-coordinate of direction the line is pointing in[enter to confirm]
5.enter x-coordinate of direction the line is moved in [enter to confirm]
6.enter y-coordinate of direction the line is moved in[enter to confirm]
7.enter number of marbles moved [enter to confirm]