Release v0.8.0

• [BREAKING] now able to retrieve dcSbus with a dedicated method (and not with the old get_Sbus).
  If you previously used gridmodel.get_Sbus() to retrieve the Sbus used for DC powerflow, please use
  gridmodel.get_dcSbus() instead.
• [DEPRECATED] in the cpp class: the old SecurityAnalysisCPP has been renamed ContingencyAnalysisCPP
  (you should not import it, but it you do you can from lightsim2grid.securityAnalysis import ContingencyAnalysisCPP now)
• [DEPRECATED] in the cpp class: the old Computers has been renamed TimeSerieCPP
  (you should not import it, but it you do you can from lightsim2grid.time_serie import TimeSerieCPP now)
• [FIXED] now voltage is properly set to 0. when shunts are disconnected
• [FIXED] now voltage is properly set to 0. when storage units are disconnected
• [FIXED] a bug where non connected grid were not spotted in DC
• [FIXED] a bug when trying to set the slack for a non existing genererator
• [FIXED] a bug in init from pypowsybl when some object were disconnected. It raises
  an error (because they are not connected to a bus): now this function properly handles
  these cases.
• [FIXED] a bug leading to not propagate correctly the "compute_results" flag when the
  environment was copied (for example)
• [FIXED] a bug where copying a lightsim2grid GridModel did not fully copy it
• [FIXED] a bug in the "topo_vect" comprehension cpp side (sometimes some buses
  might not be activated / deactivated correctly)
• [FIXED] a bug when reading a grid initialize from pypowsybl (trafo names where put in place
  of shunt names)
• [FIXED] read the docs was broken
• [FIXED] a bug when reading a grid from pandapower for multiple slacks when slack
  are given by the "ext_grid" information.
• [FIXED] a bug in "gridmodel.assign_slack_to_most_connected()" that could throw an error if a
  generator with "target_p" == 0. was connected to the most connected bus on the grid
• [FIXED] backward compat with "future" grid2op version with a
  better way to copy LightSimBackend
• [ADDED] sets of methods to extract the main component of a grid and perform powerflow only on this
  one.
• [ADDED] possibility to set / retrieve the names of each elements of the grid.
• [ADDED] embed in the generator models the "non pv" behaviour. (TODO need to be able to change Q from python side)
• [ADDED] computation of PTPF (Power Transfer Distribution Factor) is now possible
• [ADDED] (not tested) support for more than 2 busbars per substation
• [ADDED] a timer to get the time spent in the gridmodel for the powerflow (env.backend.timer_gridmodel_xx_pf)
  which also include the time
• [ADDED] support for more than 2 busbars per substation (requires grid2op >= 1.10.0)
• [ADDED] possibility to retrieve the bus id of the original iidm when initializing from pypowsybl
  (return_sub_id kwargs). This is a "beta" feature and will be adressed in a better way
  in a near future.
• [ADDED] possibility to continue the grid2op 'step' when the solver converges but a load or a
  generator is disconnected from the grid.
• [IMPROVED] now performing the new grid2op create_test_suite
• [IMPROVED] now lightsim2grid properly throw BackendError
• [IMPROVED] clean ce cpp side by refactoring: making clearer the difference (linear) solver
  vs powerflow algorithm and move same type of files in the same directory. This change
  does not really affect python side at the moment (but will in future versions)
• [IMPROVED] CI to test on gcc 13 and clang 18 (latest versions to date)
• [IMPROVED] computation speed: grid is not read another time in some cases.
  For example, if load and generators do not change, then Sbus is not
  recomputed. Likewise, if the topology does not change, then the Ybus
  is not recomputed either see #72