CalcIt Commands

Adds the contents of ArrExpr at the end of the arr.  If optional parameter unique is TRUE then only values not already in arr will be added.

NOTE: To add only one element at the end, Instead of this command,  a shorter syntax, can be used,  for the same effect:

arr():='New element at the end';

The above syntax adds 'New element at the end' at the end of the array arr. The empty set of parentheses means: Add a new element at the end. The assignment changes it.