Fixed array.length syntax
fixed bug in isTriangular method
Swapped round print method prettyPrint() to shows rows in more conventional numbering
Fixed iterative error in isSymmetrical similar to error earlier with isTriangular
Revert "Swapped round print method prettyPrint() to shows rows in more conventional numbering"

This reverts commit 0ece447ad80c337e41dd24f7421defab5153abbb.
First Commit