Sorting of Columns should be optional when allColumns is true in the toString() method

[riteshmukim]

There is a scenario where the order of the columns matter and there can be dynamic columns added at the end of the object. So, it is required to have the allColumns paramater set to true, but then the colums are sorted by default. This should be moved to the parameter of the toString() method and set to true by default when allColumns is true.