CellTuple
This class represents a cell tuple of a fixed dimension. The user can set and query the different components of the tuple.
initialize
creates a new cell tuple. Its argument is either an array of cells, or a sequence of cells.
[]
returns the k^th entry
[]=
sets the k^th entry to be the given cell
clone
returns a shallow copy of the cell tuple
show
prints debuging information
[Validate]