More swapping choices

[crazy4groovy]

Right now, can only swap individual numbers. This means the number pattern never changes, even if the number values do.

Also provide column and row swappers to:

• swap "square" single columns or rows, (within the "3x3 square")
  • i.e. range: 0-2, 3-5, 6-8
  • i.e. swap square col 0 <--> 1 OK, but 2<-->5 not OK because crosses between squares.
• swap "board" grouped columns or rows (length/width = 3 squares)
  • i.e. range: 0-2