Simple Spread Sheet

	Consists of a simple excel-like application.
	
	- You have a matrix of cells indexed by columns (A to Z) and rows (1 to 100).
	- Each cell can be a number (Absolute value) or a Formula (related to other cells).
	- Formulas can be the basic operations (Addition, Subtraction, Division, Multilication).
	- Formulas can be related to other Formulas
	
	Now we have four other types of cells
	
	- Text Cells
	- Reference Cells
	- Merged Cells