Use copy_if and max_element rather than for loops.

Fixes #8. This will match the gap-filling scoop's perms
with those of the adjacent scoop. Then, for any
gap-filling scoops that are not executable, fill their
contents with f4s.

Thanks to a change to the time when scoops are
added to the file's data scoops, the clause that
removes empty data scoops should not *always*
remove empty scoops from the set of global scoops.

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.)

Handle overlapping sections properly. This
was a problem with calculation of the gap
between two sections that happen to overlap.
It resulted in a negative gap that turned
into a very large positive number.

Add padding sections to a zipr'd program where
the gap between two existing sections is greater
than a certain minimum boundary.

Removed bea engine from lots of inclue places and link steps, changed verbose mode for zipr to false, added very-verbose mode for zipr.  fixed a few zipr bugs related to non-existant fallthroughs, etc.