[MRG] Update PR: deduce ksize from query

[ctb]

Updates #119 so tests pass.

• Is it mergeable?
• make test Did it pass the tests?
• make coverage Is the new code covered?
• Did it change the command-line interface? Only additions are allowed
  without a major version increment. Changing file formats also requires a
  major version number increment.
• Was a spellchecker run on the source code and documentation after
  changes were made?

[ctb]

Note, includes #217 which will be merged as soon as CI passes.

[codecov-io]

Codecov Report

Merging #224 into master will decrease coverage by 0.13%.
The diff coverage is 76.47%.

@@            Coverage Diff             @@
##           master     #224      +/-   ##
==========================================
- Coverage   85.78%   85.64%   -0.14%     
==========================================
  Files          13       13              
  Lines        1942     1951       +9     
  Branches       52       52              
==========================================
+ Hits         1666     1671       +5     
- Misses        266      270       +4     
  Partials       10       10

Impacted Files	Coverage Δ
sourmash_lib/sourmash_args.py	93.42% <100%> (+0.17%)	⬆️
sourmash_lib/commands.py	90.07% <71.42%> (-0.5%)	⬇️

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[ctb]

@betatim ok to merge?

[luizirber]

👍