Pandapower

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- [FIXED] another correction of shunt values in CIGRE HV
- [FIXED] deprecated np.typedict to np.sctypedict in cim converter
- [ADDED] reporting for cim2pp converter
- [ADDED] interfaces for repair functions for cim2pp converter
- [ADDED] using PandaModels to optimize reactive power provision for loading reduction
- [FIXED] several bugs in cim2pp converter, e.g. non linear tap changer issue
- [FIXED] shape issues when calculating SC with the superposition method
- [FIXED] typos in cim2pp tutorial
- [FIXED] creating geo coordinates form GL profile when ConnectivityNode is only in tp/tp_bd profile for cim2pp converter
- [FIXED] bugfix in _get_bus_v_results where vm_pu was not set for DC power flow, leading to old results staying in the bus results table
- [ADDED] simple cim2pp converter test
- [CHANGED] run ac pf instead of dc pf in estimation when parameter fuse_buses_with_bb_switch != 'all'
- [REMOVED] support for deprecated functions in :code:`groups.py`: :code:`check_unique_group_names`, :code:`append_to_group`

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- [FIXED] add minimum Python version (3.8) explicitly to setup.py
- [FIXED] remove :code:`import pandapower.test` from :code:`__init__`
- [FIXED] matplotlib imports are optional (but required for plotting)
- [FIXED] missing numpy int imports
- [FIXED] documentation; needed change: group functions parameter :code:`raise_` is renamed by :code:`raise_error`

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- [ADDED] feature: storing to json and restoring of nets with pandas multiindex dataframes and series
- [ADDED] several 'marker size legends' sizes + a spec. color can be passed to weighted_marker_traces
- [CHANGED] changed default optimization method in the estimation module from OptAlgorithm to "Newton-CG"
- [CHANGED] cim2pp converter documentation fixes
- [CHANGED] make legend item size constant in :code:`simple_plotly`
- [FIXED] add (nan) field "coords" to bus geodata in create_cigre_network_hv to avoid fatal error when exporting to Excel
- [FIXED] documentation of powerfactory converter
- [FIXED] create.py: if optional arguments are None or nan, the optional columns will not be added
- [FIXED] add tap_dependent_impedance attributes to trafo3w instead of trafo, in create.create_transformer3w and create.create_transformer3w_from_parameters
- [CHANGED] renamed functions: drop_from_group() -> detach_from_group(), append_to_group() -> attach_to_group(), check_unique_group_names() -> check_unique_group_rows()
- [CHANGED] attach_to_group(): enable handling of different reference_column passed than existing
- [ADDED] toolbox function :code:`count_elements`, :code:`drop_elements`, :code:`res_power_columns`
- [ADDED] new group functions :code:`element_associated_groups`, :code:`attach_to_groups`, :code:`group_res_power_per_bus`, :code:`group_index`
- [CHANGED] __repr__ (used by print(net)) now considers groups appropriately
- [ADDED] documentation of DeprecationWarning process
- [ADDED] add TDPF parameters as optional parameters for create line functions in create.py
- [CHANGED] remove support for Python 3.7 and add Python 3.11
- [CHANGED] split toolbox.py -> better overview, avoiding circular imports
- [CHANGED] aim for toolbox parameter name consistency: element_types, element_index (changes to mandatory parameters only)
- [CHANGED] output type of toolbox function :code:`element_bus_tuples`: set -> list
- [ADDED] import of internal packages such as control or converter
- [ADDED] group consideration in toolbox replace element functionality
- [ADDED] implementation of the "recycle" functionality for DC power flow and timeseries with run=pp.rundcpp
- [ADDED] calculate branch results for current magnitude and angle, voltage magnitude and angle, active and reactive power for short circuit calculation
- [ADDED] implement the superposition method ("Type C") for the short circuit calculation - consider pre-fault voltages
- [FIXED] Trafo control stepping direction for side=="hv"
- [ADDED] feature: protection - implementation of over-current relay
- [FIXED] Shunt admittance modelling for 3 phase calculations
- [ADDED] bulk creation function create_storages and create_wards
- [ADDED] FACTS devices Shunt Var Compensator (SVC) and Thyristor-Controlled Series Capacitor (TCSC) as new pandapower elements net.svc and net.tcsc

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- [ADDED] a 'marker size legend' (scale_trace) can be displayed for weighted_marker_traces with plotly
- [FIXED] bugfix in toolbox._merge_nets_deprecated
- [CHANGED] added tests for pp.control.Characteristic, removed Characteristic.target

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- [ADDED] plotting function for dclines (create_dcline_collection), also added in simple_plot
- [ADDED] calculation of overhead line temperature in Newton-Raphson with two simplified methods (Frank et al. and Ngoko et al.)
- [ADDED] group functionality
- [ADDED] auxiliary function warn_and_fix_parameter_renaming to throw a derpecation warning (not an Error) if old name of a parameter is used
- [ADDED] zero-sequence parameters for net.impedance
- [ADDED] File I/O: Can now save and load pandapower serializable objects to Excel, PostgreSQL
- [ADDED] additional_traces (prepared by the user) can be passed to simple_plotly
- [ADDED] Added converter CGMES v2.4.15 to pandapower
- [CHANGED] TDPF: rename r_theta to r_theta_kelvin_per_mw, add r_theta_kelvin_per_mw to net.res_line
- [CHANGED] Compatibility with pandas 1.5, dropped "six" dependency
- [CHANGED] from_ppc(): revision of indexing and naming of elements
- [CHANGED] Complete revision of validate_from_ppc()
- [ADDED] helper functions for contingency calculation
- [CHANGED] Improve defaults, add docstrings and rename parameters of plot_voltage_profile() and plot_loading()
- [CHANGED] merge_nets(): revised for groups and new behavior regarding indexing; reindex_elements(): revised for groups, don't overwrite column "index" and feature parameter lookup
- [FIXED] Bug with user_pf_options: _init_runpp_options in auxiliary.py ignored user_pf_options when performing sanity checks

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- [FIXED] remove the parameter ignore_order in DeepDiff (__eq__), add __hash__ to JSONSerializableClass
- [ADDED] store and restore functionality of dataframe index names with to_json() and from_json()
- [ADDED] generalization from_json() with parameter empty_dict_like_object