Quiet align.chpl errors on Intel and PGI.

Changed align.chpl to better demonstrate the original intent.
Added a new future to demonstrate the compiler-dependent behavior.

This seems like it would be more clearly/maintainably written as:

const maxS1 = maxS:int(64) + 1;

A quick check shows that this results in an int(64) with the value you're looking for, as hoped.