pandapipes 0.2.0

• [ADDED] added the pipeflow option "reuse_internal_data" which allows to reuse the system matrix from one pipeflow to the next in combination with "only_update_hydraulic_matrix" - useful for timeseries calculations
• [ADDED] hydrogen properties
• [ADDED] Swamee-Jain friction model
• [ADDED] test networks (water) for Swamee-Jain friction model
• [ADDED] further explanation in the documentation, e.g. on heating networks and time series / controller
• [ADDED] heating network and time series tutorials
• [ADDED] enable net loading built in different pandapipes versions
• [ADDED] carry over new artificial coordinate functions from pandapower
• [ADDED] functionality to create_networkx graph for pandapipes networks
• [ADDED] tests for connected components searches in pandapipes networks
• [CHANGED] property files for bi-atomic gases
• [CHANGED] make ppipe_hook serializable and inherit from pp_hook by using decorators
• [CHANGED] changed column "controller" in controller table to "object"
• [CHANGED] changes in run_control/run_time_series for better pandapower code reusability like using initial_run variable instead of initial_pipeflow
• [CHANGED] names of parameters for regression function in pump
• [CHANGED] pressure lift for pumps is now always >= 0
• [CHANGED] on reverse flow, the pressure lift for pumps is 0
• [CHANGED] add_fluid_to_net is now a private function (usually the wrapper create_fluid_from_lib should be used)
• [FIXED] direction of pump in the water test network 'versatility' for OpenModelica
• [FIXED] accurate calculation of v in get_internal_results for pipes
• [FIXED] enable loading of nets containing controller