Extended override

[chfw]

Before raising the PR, here is a check list:

• have you written unit tests for your code changes?
• have you updated the change log?
• can someone else understand your changes without your explanation?
• are you proud of your code changes?
• please add your name and github link to contributors.rst in alphabetical order.

delivers #126

[codecov-io]

Codecov Report

Merging #321 into dev will decrease coverage by 0.05%.
The diff coverage is 85.71%.

@@            Coverage Diff            @@
##             dev     #321      +/-   ##
=========================================
- Coverage   95.4%   95.35%   -0.06%     
=========================================
  Files         50       50              
  Lines       2505     2517      +12     
=========================================
+ Hits        2390     2400      +10     
- Misses       115      117       +2

Impacted Files	Coverage Δ
moban/data_loaders/manager.py	95% <85.71%> (-2.92%)	⬇️

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