BAM auto-indexing and test suite updates

[standage]

This branch started as a small fix for BAM auto-indexing. But since the code has been neglected for months, I also had to do some updates to the test suite. It appears that many results depending on the random number generator have had to be updated. Numpy version incompatibility perhaps? Anyway, the updates to the test suite swamped the BAM auto-indexing code, which I'll try to highlight below. Closes #76.

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• [x] Changes are clearly described above
• [x] Any relevant issue threads are referenced in the description
• [x] Any new features are tested (see docs/DEVEL.md for details)
• [x] Substantial changes are documented in CHANGELOG.md (see https://keepachangelog.com/en/1.0.0/)

[standage]

Aside from the two code blocks above, all changes are basically just addressing bitrot/atrophy.

[codecov-io]

Codecov Report

Merging #78 (5f9b60f) into master (5818044) will increase coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #78      +/-   ##
==========================================
+ Coverage   97.57%   97.59%   +0.01%     
==========================================
  Files          25       25              
  Lines         743      749       +6     
  Branches      141      141              
==========================================
+ Hits          725      731       +6     
  Misses          8        8              
  Partials       10       10              

Impacted Files	Coverage Δ
microhapulator/type.py	97.10% <100.00%> (-0.13%)	:arrow_down:
microhapulator/profile.py	99.14% <0.00%> (+0.03%)	:arrow_up:
microhapulator/__init__.py	93.18% <0.00%> (+0.15%)	:arrow_up:

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[standage]

The pending CI build is an artifact of the migration from travis-ci.org to travis-ci.com. (And it looks like Travis CI has gone down the tubes, but that's a topic for a different PR.)