split toolbox.py and other improvements

[SteffenMeinecke]

• [CHANGED] split toolbox.py -> better overview, avoiding circular imports
• [ADDED] group consideration in toolbox replace element functionality
• [CHANGED] renamed functions: check_unique_group_names() -> check_unique_group_rows()
• [CHANGED] attach_to_group(): enable handling of different reference_column passed than existing
• [ADDED] toolbox function 'count_elements', 'drop_elements'
• [ADDED] new group functions 'element_associated_groups', 'attach_to_groups'
• [CHANGED] repr (used by print(net)) now considers groups appropriately
• [FIXED] get_equivalent()
• [CHANGED] aim for toolbox parameter name consistency: element_types, element_index (changes to mandatory parameters only)

[codecov]

Codecov Report

Patch coverage: 88.17% and project coverage change: +0.13 🎉

Comparison is base (bca4efe) 72.20% compared to head (74084f9) 72.33%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1886      +/-   ##
===========================================
+ Coverage    72.20%   72.33%   +0.13%     
===========================================
  Files          197      202       +5     
  Lines        24439    24643     +204     
===========================================
+ Hits         17646    17826     +180     
- Misses        6793     6817      +24     

Impacted Files	Coverage Δ
pandapower/grid_equivalents/toolbox.py	93.89% <ø> (ø)
pandapower/sql_io.py	22.96% <ø> (-0.74%)	⬇️
pandapower/converter/pandamodels/from_pm.py	54.16% <50.00%> (ø)
pandapower/converter/powerfactory/validate.py	15.80% <50.00%> (ø)
pandapower/auxiliary.py	85.62% <73.23%> (-1.50%)	⬇️
pandapower/groups.py	84.70% <80.41%> (+0.84%)	⬆️
pandapower/toolbox_general_issues.py	84.08% <84.08%> (ø)
pandapower/grid_equivalents/rei_generation.py	91.64% <84.61%> (-0.92%)	⬇️
pandapower/toolbox_elm_selection.py	84.82% <84.82%> (ø)
pandapower/toolbox_grid_modification.py	90.39% <90.39%> (ø)
... and 22 more

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