Get restrictions as dicts

[jesper-friis]

Description

Added a return_dicts keyword argument to the Triplestore.retrictions() method, to allow to get the restrictions as dicts instead of blank nodes.

Other changes:

• Also renamed the target argument of Triplestore.add_retriction() and Triplestore.retrictions() to value in order to be consistent with the naming in EMMOntoPy. These two methods are a very new addition to tripper that haven't been used yet. This change that this change will break existing code is therefore very small.
• Added tests.
• Added documentation in the tutorial.

Question
Should we change the default of return_dicts to be true? If so, this is the right time to do it, before people starts to use these methods.

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?
• Is the code properly tested?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.41%. Comparing base (f7488f5) to head (d0a205e).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #225      +/-   ##
==========================================
+ Coverage   78.34%   78.41%   +0.07%     
==========================================
  Files          18       18              
  Lines        1690     1696       +6     
==========================================
+ Hits         1324     1330       +6     
  Misses        366      366              

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[francescalb]

Some suggested changes to the tutorial, but only wording. It looks very good!

I think we should change to return_dicts = True as default as also changing target to value is a breaking change. We just have to state very clearly in the release that this is done, and that thisis a breaking change on a a feature that was added in the previous realease.

[francescalb]

Very nice.