hi_sparse_bitset 0.9.0

Hierarchical sparse bitset. Incredibly high performance. Compact memory usage.
Documentation 
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# v.1


In little endian.
```text
lvl0_mask
[lvl1_mask;..]
[data;..]
```
Where
* `lvl0_mask` = `Level0BitBlock`
* `lvl1_mask` = [`Level1BitBlock`; `lvl1_len`]
* `data` = [`DataBitBlock`; `data_len`]