Resolve "Overlapping sections cause problem with padding code."

This fixes an issue where a pinned address was

1. unpinned
2. reserved as part of a chain
3. exists in a sled

and all hell broke loose. The fix is to make sure that the pinned addresses are only recorded after the initial unpinning code happens.

As a further fix, there should be a function that unpins an address (it would reset the ibta of the instruction and clear the pinned address map.)

Closes #5 (closed)