Remove unused code

[speleo3]

Attention: This is rigorous cleanup! I removed code which appears to be broken, unused or unreachable within the code base. I cannot rule out that anything of that is used from external code, although I believe that it's very unlikely.

• Remove all code which was previously marked with NotImplementedError("unused")
• Remove unsued command line arguments
• Remove unused arguments, replace mutable defaults
  • Closes https://github.com/jensengroup/propka/issues/53
  • Closes https://github.com/jensengroup/propka/issues/56

[codecov[bot]]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (6ee0df8) 74.84% compared to head (25ed65e) 77.45%.

Files	Patch %	Lines
propka/lib.py	75.00%	1 Missing :warning:
propka/parameters.py	96.66%	1 Missing :warning:
propka/version.py	83.33%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #187 +/- ## ========================================== + Coverage 74.84% 77.45% +2.61% ========================================== Files 25 25 Lines 4118 3952 -166 ========================================== - Hits 3082 3061 -21 + Misses 1036 891 -145 ```

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[speleo3]

Sorry, I don't have the bandwidth for a real review. I only had a very quick look at the changes and the coverage changes. The fact that code was removed that was not covered by tests is good. Overall I like the streamlining. Thanks for doing all the work!

Thanks for having a look and thanks for your support!