fix CLI interface, now with subcommands 'all' and 'crdsplit'

[laverya]

No description provided.

[codecov]

Codecov Report

Merging #36 (3af8740) into master (c4891e6) will increase coverage by 2.02%.
The diff coverage is 76.00%.

@@            Coverage Diff             @@
##           master      #36      +/-   ##
==========================================
+ Coverage   72.97%   75.00%   +2.02%     
==========================================
  Files           1        1              
  Lines          74       88      +14     
==========================================
+ Hits           54       66      +12     
- Misses         11       13       +2     
  Partials        9        9              

Impacted Files	Coverage Δ
pkg/ksplit.go	75.00% <76.00%> (+2.02%)	⬆️

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