Feat/read sfcf multi (#210)

* make template

* read_sfcf_multi running with compact format

* fix append mode, norrmal tests work

* improve readability

* add simple test for multi_read

* simple multi_test works

* add first method to check sfcf param hashes

* add docstring

* simple test for o format working

* use benedict to make loops easier

* introduce python-benedict as dep

* no nice_out, less error prone, found bug in tests

* Revert "introduce python-benedict as dep"

This reverts commit 9696d68.

* Revert "use benedict to make loops easier"

This reverts commit fa39874.

* no nice output after reverts

* [build] Added jkuhl-uni as CODEOWNER for sfcf.

* refactor: flatten internal dicts

* very small test extension

* ...flake8

* docu

* Delete second sep init

---------

Co-authored-by: Fabian Joswig <fabian.joswig@uni-muenster.de>

Author: jkuhl-uni

.github/CODEOWNERS

@@ -2,3 +2,5 @@
 /pyerrors/covobs.py @s-kuberski
 /pyerrors/input/json.py @s-kuberski
 /pyerrors/input/dobs.py @s-kuberski
+/pyerrors/input/sfcf.py @jkuhl-uni
+/tests/sfcf_in_test.py @jkuhl-uni