Why is there an upper limit for Tpetra::CrsMatrix constructor?

[abodado]

@tpetra, @csiefer2
Just curious as to why there is an upper limit on the max number of entries per row on the Tpetra::CrsMatrix constructor. This is a different design compared to Epetra, where in Epetra, if trying to insert more than the "suggested" max entries in a given row, more memory would be allocated. Is there any documentation as to why this design change was made? What are the benefits of this design change? I see that there is another constructor where I can specify an array that contains the max number of entries per row. I suppose I will have to go that route but it does add complexity to my code, so I was wondering if there are any other work-arounds or if Tpetra will at some point allow going over the max entry per row with the additional memory allocation hit, as occurs in Epetra.