Improved comparing literals

[jesper-friis]

Description:

Improved literal equality comparisons. They now compare as expected.

Note, this PR builds on top of PR #163

Closes #161

Type of change:

• Bug fix and code cleanup.
• New feature.
• Documentation update.
• Testing.

Checklist for the reviewer:

This checklist should be used as a help for the reviewer.

• Is the change limited to one issue?
• Does this PR close the issue?
• Is the code easy to read and understand?
• Do all new feature have an accompanying new test?
• Has the documentation been updated as necessary?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 82.89474% with 13 lines in your changes missing coverage. Please review.

Project coverage is 75.94%. Comparing base (11f37ba) to head (666cf63).
Report is 178 commits behind head on master.

Files with missing lines	Patch %	Lines
tripper/triplestore.py	44.44%	10 Missing ⚠️
tripper/literal.py	93.18%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #164      +/-   ##
==========================================
- Coverage   76.05%   75.94%   -0.12%     
==========================================
  Files          17       17              
  Lines        1491     1534      +43     
==========================================
+ Hits         1134     1165      +31     
- Misses        357      369      +12     

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[ajeklund]

Thank you! I have provided a couple of questions.

[ajeklund]

Tried to clarify one of my comments., and added a new one.

[ajeklund]

Nice! Thank you for fixing this!