Add test and fix for uneven blocks

[yuxuanzhuang]

Fixes #140

Changes made in this Pull Request:

• change np.hstack to np.concatenate in all _conclude code
• add tests for uneven blocks.

PR Checklist

• [x] Tests?
• [x] Docs?
• [x] CHANGELOG updated?
• [x] Issue raised/referenced?

[orbeckst]

let's fix #143 first to get CI back on track

[orbeckst]

@VOD555 if you have any comments on this PR please review

[yuxuanzhuang]

Looks ok to me. The output did not change for anything that we already had, right?

No, it should do nothing to the output.

[codecov[bot]]

Codecov Report

Merging #141 into master will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #141   +/-   ##
=======================================
  Coverage   97.93%   97.93%           
=======================================
  Files          12       12           
  Lines         775      775           
  Branches       91       91           
=======================================
  Hits          759      759           
  Misses         10       10           
  Partials        6        6           

Impacted Files	Coverage Δ
pmda/parallel.py	98.50% <ø> (ø)
pmda/contacts.py	96.22% <100.00%> (ø)

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