Add 'reverse' weed to keep only selected split k-mers

[johnlees]

Can be useful for e.g. keeping only the core genome

[codecov]

Codecov Report

Patch coverage: 68.00% and project coverage change: -0.32 ⚠️

Comparison is base (893a674) 82.43% compared to head (935ebfb) 82.11%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #24      +/-   ##
==========================================
- Coverage   82.43%   82.11%   -0.32%     
==========================================
  Files          15       15              
  Lines        1554     1571      +17     
  Branches      273      277       +4     
==========================================
+ Hits         1281     1290       +9     
- Misses        107      108       +1     
- Partials      166      173       +7     

Impacted Files	Coverage Δ
src/generic_modes.rs	69.23% <25.00%> (-2.20%)	⬇️
src/merge_ska_array.rs	90.33% <50.00%> (-0.76%)	⬇️
src/cli.rs	67.93% <66.66%> (-0.03%)	⬇️
src/lib.rs	73.02% <100.00%> (-0.04%)	⬇️

... and 1 file with indirect coverage changes

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