Protected Class OptionList
OptionList is a class representing options in a PopupMenu.
It can be either an array of values and optionally tags, or a boolean (True/False)
Usage in a cell is :
cell(10,10)=new OptionList(1,array("this","that","the other"))
result=cell(10,10) //returns the item at index 1, "that"
If a cell has no optionlist, but is a popup type, the columnTag
will be checked for an optionlist, and if found, the column's OptionList
will be cloned for cells in that column as needed.