Deal with palindromes

[johnlees]

i.e. own self-rc k-mers

Closes #27

[codecov]

Codecov Report

Patch coverage: 74.00% and project coverage change: +0.47 🎉

Comparison is base (d9beb84) 82.11% compared to head (20eac85) 82.59%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #30      +/-   ##
==========================================
+ Coverage   82.11%   82.59%   +0.47%     
==========================================
  Files          15       15              
  Lines        1571     1643      +72     
  Branches      277      289      +12     
==========================================
+ Hits         1290     1357      +67     
+ Misses        108      104       -4     
- Partials      173      182       +9     

Impacted Files	Coverage Δ
src/ska_dict/split_kmer.rs	85.81% <66.66%> (-0.32%)	⬇️
src/ska_dict.rs	82.64% <73.91%> (-4.32%)	⬇️
src/ska_dict/count_min_filter.rs	97.05% <100.00%> (+13.23%)	⬆️

... and 7 files with indirect coverage changes

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