DS - STACK - integer stack - more tests.
DS - STACK - integer stack - resizing on push when stack is full.
DS - STACK - integer stack - renaming.
DS - LINKED LIST - where all hell is loose. This commit though is intentional and not a mistake on the part of the author.
DS - Generic Linked List - making circular list check robust.
DS - Generic Linked List - correcting an old and known bug.
DS - Cleanup and logic correction.