[WIP] Summarize insertions

[Donaim]

Closes #390

[codecov]

Codecov Report

❌ Patch coverage is 92.63158% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.26%. Comparing base (a806b96) to head (4bf13b7).
⚠️ Report is 17 commits behind head on master.

Files with missing lines	Patch %	Lines
micall/core/aln2counts.py	88.23%	6 Missing ⚠️
micall/g2p/fastq_g2p.py	97.72%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1684      +/-   ##
==========================================
+ Coverage   86.94%   87.26%   +0.31%     
==========================================
  Files          30       30              
  Lines        7379     7461      +82     
==========================================
+ Hits         6416     6511      +95     
+ Misses        963      950      -13     

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