[Prophesy] Diff to transform converter

[Daniel Phillips]

Today's update includes detection of overflow in and automatic expansion of 
the two arrays of unpredictable size.  To regularize this somewhat messy 
operation a little, the array handling for one of the two was rewritten as 
pointer arithmetic so that both cases fit the model of output into an array 
with variable base, limit and current position.  A common 'expand' function 
is thus able to handle both cases.

This code is almost ready to be pressed into service.

-- 
Daniel
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