Pandapipes

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- [ADDED] shapely as additional requirement (due to the stanet2pandapipes converter)
- [ADDED] missing components in collection docu were added
- [FIXED] undetected failing tests fixed

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- [ADDED] new component `flow controller`: a branch component that controls the flow through itself. The flow controller component is able to keep its mass flow fixed. It adapts the pressure drop between two junctions to reflect the desired flow situation.
- [ADDED] new component `mass_storage` and tutorial how to use it
- [ADDED] a stanet converter has been added incl. a stanet converter documentation
- [ADDED] in the course of the stanet converter release a component called valve-pipe was introduced. It is a combination of a valve and a pipe
- [ADDED] automated release process
- [ADDED] documentation added for circulation pumps of any kind, compressors, flow controller, pressure controller and mass storage
- [ADDED] adding property based on the sutherland model as additional FluidProperty
- [ADDED] besides regression models it is also possible to use interpolation models in case of StdTypes
- [ADDED] enable bulk creation of flow controls and ext grids
- [ADDED] toolbox function to extract the _pit (pandapipes internal tables) structure for nodes and branches as pandas tables with meaningful names for the stored columns as given in the node_idx and branch_idx files
- [ADDED] new global variable `__format_version__` that shall only be increased in case of API changes (i.e. if the convert_format function for JSON I/O must be called)
- [ADDED] documentation check which is able to throw errors in case of warnings
- [ADDED] example networks including new component types for the convert_format test
- [CHANGED] circ pump is now a branch component
- [CHANGED] default roughness parameter `k_mm` for pipes is now 0.2 mm instead of 1 mm (all create_pipe... functions)
- [CHANGED] instead of from and to junction, in case of circulation pumps it is called return and flow junction from now on
- [CHANGED] suffix 'flow' added to input variable p, t an mass in case of circulation pumps
- [CHANGED] ctrl/ts_variables dict in multinet gets an intermediate level 'nets', so that the structure is similar to Multinet ADict
- [CHANGED] order of the pump entries was adapted (v, p, degree)
- [CHANGED] by default p and t are set to None in case of ext grids. Based on the type selected, p and t must be adapted accordingly. If set to 'auto', based on the given p and t values, the type is set
- [CHANGED] 'auto' can also be set for type in case of circulation pumps. The behavior is the same as in case of ext grids
- [CHANGED] authors list adapted
- [CHANGED] as of now, not one but two example nets (water and gas) will be created for the convert_format test (ensure backward compatibility when loading nets from jsons)
- [FIXED] the references to pipeflow procedures have changed. Caused problems in the documentation
- [FIXED] removed unused import of 'progress_bar' from pandapower which caused import problems

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- [ADDED] automated test with Python 3.10 added to GitHub Actions CI (now Python 3.7 - 3.10)
- [ADDED] function to test tutorials / jupyter notebooks for raised errors
- [ADDED] add tests for tutorials to GitHub Actions
- [ADDED] some internal functions of the hydraulic calculation are also implemented with numba's Just-in-time compilation mode for speed-up (switch on/off with the use_numba flag)
- [ADDED] function for subnet selection
- [ADDED] functions for standard type changes
- [ADDED] added \__eq__ method for JSONSerializableClass using deepdiff library in pandapower. Required adjustments in property comparison test.
- [CHANGED] timeseries progress bar now shown with tqdm as in pandapower
- [CHANGED] some restructuring (the pf package now contains different modules for pipeflow internals)
- [CHANGED] for hydraulic calculation, the derivatives and some result extraction functions were made global (previously in component models). Components can influence the calculation beforehand/afterwards (e.g. for pressure lift) in pre-/ post derivative calculation functions.
- [CHANGED] standard types now under net.std_types instead of net.std_type
- [CHANGED] renaming extract_results to init_results in component_models
- [CHANGED] standard types are created, not added anymore
- [FIXED] bugfix to resolve problems with numpy indexing (especially with numpy.repeat) in some component models
- [FIXED] HHV/LHV for H2 corrected
- [FIXED] only considering external grids, which are in service
- [FIXED] preventing unexpected behavior of pressure control component or displaying logger warnings
- [FIXED] usage of tqdm for progress bar print
- [FIXED] individual run function can be passed in run_timeseries now (test added)
- [FIXED] converged flag set equals to False at the beginning of each pipeflow

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- [ADDED] Adding `pressure controller` as new component
- [ADDED] Adding `compressor` as new component
- [ADDED] Compressing power of a pump component are returned as result
- [ADDED] Adding polynomial fluids
- [CHANGED] Removing irrelevant results in branch models with zero length (mean velocity, lambda, reynolds)
- [FIXED] Only ext grids in service are considered
- [FIXED] Converting format of the nets in a multinet correctly
- [FIXED] Changes in pandas are considered
- [FIXED] Bug with multinet controller in run_control
- [FIXED] Bugfix in pandapower changed function cleanup in run_timeseries

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- [ADDED] Enabling encryption of pandapipes networks
- [CHANGED] Removing p_scale from default net options
- [FIXED] Input of get_compressibility in fluids.py is pressure, not temperature

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- [ADDED] Six new tutorials.
- [ADDED] Adding flag in run_control if controller convergence should be checked in each level or just at the end.
- [ADDED] Adding variables to change collection colors more specifically.
- [ADDED] Added flag in fluid for constant fluid properties if warning is displayed or not in case of several input variables.
- [ADDED] Added function in graph_searches.py to determine junction distances.
- [CHANGED] Deleted one tutorial for heating networks. Another one was updated.
- [CHANGED] Deleted tutorial sections from the documentation. These should be available only via the corresponding homepage.
- [CHANGED] compressibility and der_compr for hydrogen is now for 273.15 K (instead of 293.15 K before).
- [CHANGED] Small updates in the pandapipes documentation.
- [CHANGED] Adding a maximum number of iterations when using colebrook friction model.
- [CHANGED] In fluids changed function name get_property into get_at_value.
- [CHANGED] In std_type renaming attribute type into component.
- [FIXED] Bugfix in controller what to do by default in case on net divergence.