Allow keyword redefinition

[francescalb]

Description

Desired behaviour:

It should be allowed to redfine keywords locally. This means that keywords in the default are overwritten. For instance: vcard:hasName can be overwritten to fam:hasName.

This behaviour is needed, but should be treated with care.

We use the argument redefine with thre possible values:
'true' (warning issued), 'skip' (warning issued), 'raise' (default)

Default raise: Raises an error to make sure that the choice of allowing redefinition of or skipping new of keywords is always an active choice .

In practice this argument will often be set to true or skip, but by having the default False it should reduce the risk of doing it without intending to.

'true': existing keywords will be redefined, i.e. overwritten in the local context.

'skip': if a keyword that already is set is tried to be defined it will be skipped. This will typically happen if you have a prefLabel in your ontology that is the same as an existing keyword. With skip, this keyword will stay as the original. It should issue a warning and say that you should not use the keyword/preflabel alone for documentating this property/class but the curie.

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

❌ Patch coverage is 98.30508% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.93%. Comparing base (754b688) to head (2acefb1).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
tripper/datadoc/keywords.py	98.18%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #465      +/-   ##
==========================================
+ Coverage   84.84%   84.93%   +0.08%     
==========================================
  Files          30       30              
  Lines        4567     4607      +40     
==========================================
+ Hits         3875     3913      +38     
- Misses        692      694       +2     

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