[MISC] Remove unused functions.

[smehringer]

:nail_care:

This will be part of a larger restructure.

Currently the filenames are stored in the HIBF (class user_bins). This will be removed in the HIBF lib. To make adjustments easier, I will remove them within raptor first (from HIBF -> raptor_index) to ensure compatibility. This should not affect performance but it will impact serialization I fear.

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Name	Status	Preview	Comments	Updated (UTC)
raptor	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 5, 2023 9:06am

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (e8bf921) 100.00% compared to head (66a3917) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #307 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 63 63 Lines 2164 2164 ========================================= Hits 2164 2164 ``` | [Impacted Files](https://app.codecov.io/gh/seqan/raptor/pull/307?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=seqan) | Coverage Δ | | |---|---|---| | [...e/raptor/hierarchical\_interleaved\_bloom\_filter.hpp](https://app.codecov.io/gh/seqan/raptor/pull/307?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=seqan#diff-aW5jbHVkZS9yYXB0b3IvaGllcmFyY2hpY2FsX2ludGVybGVhdmVkX2Jsb29tX2ZpbHRlci5ocHA=) | `100.00% <ø> (ø)` | |

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