formcircle <radius> <terrain>

  You must be at the centre of the circle.

  It will be a circle with diameter equal to (given radius*2)+1.


     radius          example

                       *
       1              ***
                       *

                       *
                      ***
       2             *****
                      ***
                       *

                       *
                     *****
                     *****
       3            *******
                     *****
                     *****
                       *
