Check prefLabels in imported ontologies only if asked for.

[francescalb]

Description

The check for number of prefLabels was done on all classes including imported, even if imported is not given.
This is now corrected.

Also, for some reason updates in pyparsing in which methods have been renamed to python names with _ from camelcase made pylint fail, but is now fixed.

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 #628 (116f7ad) into master (e6d6e08) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #628   +/-   ##
=======================================
  Coverage   68.65%   68.65%           
=======================================
  Files          16       16           
  Lines        3292     3292           
=======================================
  Hits         2260     2260           
  Misses       1032     1032           

Impacted Files	Coverage Δ
emmopy/emmocheck.py	53.20% <100.00%> (ø)
ontopy/manchester.py	92.22% <100.00%> (ø)