Update for compatibility with dhnx, pandapipes, lpagg

Update for compatibility with dependencies

• dhnx>0.0.4 (current dev branch, specifically because of Expose setting 'allow_nonoptimal' to the user)
• pandapipes 0.12
• lpagg 0.19

Most important additions:

• Allow setting district heating temperatures in dhnx_run()
  • Forward, return flow and ground temperatures (T_FF, T_RF, T_ground) as well as maximium allowed pressure drop (dP_max) were previously read from the pipe_data file.
  • They can now be set in dhnx_run(), which will override values from the pipe_data file.
• Add elevation data download functionality
  • Elevation for polygons, lines and points can now easily be downloaded.
  • This can be used automatically in pandapipes_run(), to account for height differences in pressure calculations
    • pandapipes_run(elevation_col='height_m', download_missing_elevation=True)
• Implement KWW Technikkatalog as new data source
  • Can be used to apply values for specific heat demand to a set of buildings

(Known) breaking changes

• Make lpagg_run return the lpagg cfg (b9f5f88)
  • lpagg_run() now returns a tuple of size 3: (gdf_houses, df_load_ts_slice, lpagg_cfg)
  • lpagg_cfg can be used to e.g. retrieve the actual simultaneity factor resulting from the time shift in lpagg

Full Changelog

0.6.3...0.7.0