refactor: JOSS revision, round 1

[AngryMaciek]

Description

• add preprocessor directive for Catch
• correct typos
• correct power-assignment tests for H[P]
• add MPFR H^30 test to unit tests

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have not reduced the existing code coverage

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (1abd6b4) 100.00% compared to head (922a94d) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #37   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines          673       673           
=========================================
  Hits           673       673           

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