streamline shuttle move/copy operations

[elfkuzco]

Rationale

This PR simplifies the file movement operation of the shuttle. It does this in the following way:

• keep one current location as the source of truth since all the book data (file) is the same across all current locations
• create the target locations using this first current location while simultaneously deleting any current location that isn't the original we are holding a reference to. Caveat is that book events are now showing as copies and not really as moves from one current location to another
• delete the original location and any other current locations that are left (especially if current location is greater than target locations)

This fixes #233

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.30%. Comparing base (53ad7cf) to head (43b7d04).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #274      +/-   ##
==========================================
- Coverage   81.39%   81.30%   -0.09%     
==========================================
  Files          55       55              
  Lines        2354     2343      -11     
  Branches      233      233              
==========================================
- Hits         1916     1905      -11     
  Misses        378      378              
  Partials       60       60              

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