1. Replaced both crop margins and crop margins & page num with newer algorithm.
2. Crop max power level increased to 3.0
3. Adds NumPy as a new dependency.
* Adds --author argument to CLI
* Add --prefercoverfile and --nocoveraspage arguments to CLI
* cover checks only run once
* Revert "cover checks only run once"
This reverts commit ad7b3cc106.
* split off author portion
* split off author
* remove prefercover
* whitespace fixes
* rename to duplicatecover
* whitespace fixes
* rename to dedupecover
* add dedupe to UI
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Co-authored-by: Alex Xu <alexkurosakimh3@gmail.com>