Bring back diff output for functional tests

[ricardogsilva]

Overview

This PR adds a new --functional-prefer-diffs flag to the test runner. It enables comparison of test results with their expected values by using python's difflib.

Related Issue / Discussion

• latest dev meeting - Action A3
• Bring back comparing test results using difflib #549

Additional Information

Contributions and Licensing

(as per https://github.com/geopython/pycsw/blob/master/CONTRIBUTING.rst#contributions-and-licensing)

• I'd like to contribute [feature X|bugfix Y|docs|something else] to pycsw. I confirm that my contributions to pycsw will be compatible with the pycsw license guidelines at the time of contribution.
• I have already previously agreed to the pycsw Contributions and Licensing Guidelines

[codecov]

Codecov Report

Merging #550 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #550   +/-   ##
=======================================
  Coverage   55.93%   55.93%           
=======================================
  Files          29       29           
  Lines        6338     6338           
  Branches     1342     1342           
=======================================
  Hits         3545     3545           
- Misses       2412     2413    +1     
+ Partials      381      380    -1

Flag	Coverage Δ
#integrationtests	54.57% <ø> (ø)	⬆️
#unittests	7.63% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
pycsw/ogc/fes/fes2.py	39.13% <0%> (ø)	⬆️

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