Add option to comment out the duplicate includes

[rmisev]

• Add -d/--no-duplicates option to amalgamate.py and use it.
• Simplify the use of the -v/--verbose option of amalgamate.py

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.66%. Comparing base (0580e70) to head (8adf924).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #61 +/- ## ======================================= Coverage 99.66% 99.66% ======================================= Files 16 16 Lines 2369 2369 Branches 385 385 ======================================= Hits 2361 2361 Misses 8 8 ```

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