Change default margin order

[hombit]

Change the algorithm selecting the default margin order value: from being the smallest possible value (largest order of the catalog plus one) to be the largest possible value (so tiles would still include all objects within a given margin threshold).

Fixes #358

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[codecov[bot]]

Codecov Report

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

Project coverage is 99.72%. Comparing base (f15c21d) to head (75b4c42).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #366 +/- ## ======================================= Coverage 99.72% 99.72% ======================================= Files 26 26 Lines 1457 1457 ======================================= Hits 1453 1453 Misses 4 4 ```

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