Added doctest

[jesper-friis]

Description

Added testing of examples in documentation using doctest.

We can now add examples to our docstrings and test that they actually works. Just format the docstring the standard way:

>>> from emmopy import get_emmo
>>> emmo = get_emmo().load()
>>> emmo.Atom
emmo.Atom

Also ignored some pytest warnings. I think that those that remain should be dealt with...

Type of change

• Bug fix.
• New feature.
• Documentation update.
• Test update.

Checklist

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

• Is the code easy to read and understand?
• Are comments for humans to read, not computers to disregard?
• Does a new feature has an accompanying new test (in the CI or unit testing schemes)?
• Has the documentation been updated as necessary?
• Does this close the issue?
• Is the change limited to the issue?
• Are errors handled for all outcomes?
• Does the new feature provide new restrictions on dependencies, and if so is this documented?

Comments

[codecov]

Codecov Report

Merging #614 (4818e9a) into master (64b8e4e) will increase coverage by 0.12%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #614      +/-   ##
==========================================
+ Coverage   68.28%   68.41%   +0.12%     
==========================================
  Files          16       16              
  Lines        3172     3172              
==========================================
+ Hits         2166     2170       +4     
+ Misses       1006     1002       -4     

Impacted Files	Coverage Δ
ontopy/manchester.py	92.22% <ø> (ø)
ontopy/patch.py	65.30% <ø> (ø)

... and 2 files with indirect coverage changes