[KolSmn]

Added support for "SEPA Dauerauftrag" (fetch, create, edit, delete, get allowed parameters). Tested with DKB.

Attached my test scripts here:

get_information.py
get_standing_order_parameters.py
change_standing_order.py
change_standing_order_custom_pain.py
create_standing_order.py
delete_standing_order.py
get_standing_orders.py
parse_standing_orders.py

[codecov]

Codecov Report

❌ Patch coverage is 97.99331% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.40%. Comparing base (5ee7548) to head (784f7d6).
⚠️ Report is 49 commits behind head on master.

Files with missing lines	Patch %	Lines
fints/client.py	96.96%	3 Missing ⚠️
fints/utils.py	96.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #230      +/-   ##
==========================================
- Coverage   87.69%   87.40%   -0.30%     
==========================================
  Files          26       28       +2     
  Lines        3463     4129     +666     
==========================================
+ Hits         3037     3609     +572     
- Misses        426      520      +94     

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