Add support for up to k=63 using u128

[johnlees]

Adds generics over u64 to allow use of u128 when 31 < k <= 63. More fiddly than I expected, but main parts are:

• One megatrait RevComp adds all the needed integer traits, and adds specialisations for the reverse_complement function and other base type coversions.
• When loading arrays, they are first tried as u64. If that errors, then u128 is tried. This necessitated many of the main functions in lib.rs being lifted out and made generic.

TODO:

• [x] Update docs
• [x] cargo test -- fix existing code
• [x] cargo test -- add new tests for k=63
  • [x] Filter test
  • [x] weed
  • [x] map
  • [x] merge
  • [x] delete
  • [x] nk with full info
• [x] cargo clippy -- fix lint
• [x] cargo fmt -- before merge

[codecov[bot]]

Codecov Report

Base: 82.78% // Head: 82.53% // Decreases project coverage by -0.25% :warning:

Coverage data is based on head (a244364) compared to base (d83ac94). Patch coverage: 82.18% of modified lines in pull request are covered.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #13 +/- ## ========================================== - Coverage 82.78% 82.53% -0.25% ========================================== Files 13 15 +2 Lines 1342 1466 +124 Branches 211 258 +47 ========================================== + Hits 1111 1210 +99 + Misses 126 102 -24 - Partials 105 154 +49 ``` | [Impacted Files](https://codecov.io/gh/bacpop/ska.rust/pull/13?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bacpop) | Coverage Δ | | |---|---|---| | [src/cli.rs](https://codecov.io/gh/bacpop/ska.rust/pull/13?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bacpop#diff-c3JjL2NsaS5ycw==) | `67.76% <50.00%> (+1.65%)` | :arrow_up: | | [src/io\_utils.rs](https://codecov.io/gh/bacpop/ska.rust/pull/13?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bacpop#diff-c3JjL2lvX3V0aWxzLnJz) | `84.61% <66.66%> (-1.93%)` | :arrow_down: | | [src/lib.rs](https://codecov.io/gh/bacpop/ska.rust/pull/13?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bacpop#diff-c3JjL2xpYi5ycw==) | `73.23% <70.00%> (-4.87%)` | :arrow_down: | | [src/ska\_dict/nthash.rs](https://codecov.io/gh/bacpop/ska.rust/pull/13?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bacpop#diff-c3JjL3NrYV9kaWN0L250aGFzaC5ycw==) | `72.22% <72.22%> (ø)` | | | [src/generic\_modes.rs](https://codecov.io/gh/bacpop/ska.rust/pull/13?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bacpop#diff-c3JjL2dlbmVyaWNfbW9kZXMucnM=) | `72.30% <72.30%> (ø)` | | | [src/ska\_ref.rs](https://codecov.io/gh/bacpop/ska.rust/pull/13?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bacpop#diff-c3JjL3NrYV9yZWYucnM=) | `85.36% <75.00%> (+2.42%)` | :arrow_up: | | [src/ska\_dict.rs](https://codecov.io/gh/bacpop/ska.rust/pull/13?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bacpop#diff-c3JjL3NrYV9kaWN0LnJz) | `89.06% <81.81%> (+7.63%)` | :arrow_up: | | [src/ska\_dict/split\_kmer.rs](https://codecov.io/gh/bacpop/ska.rust/pull/13?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bacpop#diff-c3JjL3NrYV9kaWN0L3NwbGl0X2ttZXIucnM=) | `90.40% <95.00%> (+7.33%)` | :arrow_up: | | [src/merge\_ska\_array.rs](https://codecov.io/gh/bacpop/ska.rust/pull/13?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bacpop#diff-c3JjL21lcmdlX3NrYV9hcnJheS5ycw==) | `91.08% <100.00%> (-1.42%)` | :arrow_down: | | [src/merge\_ska\_dict.rs](https://codecov.io/gh/bacpop/ska.rust/pull/13?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bacpop#diff-c3JjL21lcmdlX3NrYV9kaWN0LnJz) | `77.63% <100.00%> (-4.61%)` | :arrow_down: | | ... and [9 more](https://codecov.io/gh/bacpop/ska.rust/pull/13?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bacpop) | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bacpop). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bacpop)

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[johnlees]

Note this also fixes the countmin table -- only one hash was being used rather than four