DH_Stack - Provides memory storage and retrieval of numeric values organized.

Provides memory storage and retrieval of numeric values organized as a last in first out (LIFO) Push-down stack. Values are pushed onto the top of the stack, and popped off in Reverse order. Only the topmost value is accessible at any given time. An easy way to reverse a sequence of values is to push them all onto the stack, then pop them off one by one. Values can optionally be saved to a text file when the module closes, and loaded from a text file when the module opens, to provide persistent storage, or to pre-load the stack with a predefined set of values.