Fix/sim params

[MaGering]

With this PR the following parameters are adapted for:

• Gas provider in energyProviders.csv ( inflow_direction and outflow_direction from Heat bus to Gas bus and energyVector from Heat to Gas)
• fixcost.csv (age_installed, development_costs, specific_costs_om and specific_costs are neglected in the simulations and hence set to 0. As mentioned by @SabineHaas in PR Update/csvs is #251, setting lifetime to 0 lead to a ZeroDivisionError. To give a hint that the lifetime has been set without higher intentions regarding the value, I chose a lifetime of 1 for all three components)

The following steps were realized, as well (required):

• Update the CHANGELOG.md
• Check if full simulation tests pass locally (EXECUTE_TESTS_ON=master pytest)

Also the following steps were realized (if applies):

• Use in-line comments to explain your code
• Write docstrings to your code
• For new functionalities: Explain in readthedocs
• Write test(s) for your new patch of code

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• Open
• Done

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Note that in case you do not fix a whole issue you should start your PR with Address #xyz.

_{For more information on how to contribute check the CONTRIBUTING.md.}

[Piranias]

Still need to adapt the electricity demand regarding the warm water ( see issue #290)

[MaGering]

Still need to adapt the electricity demand regarding the warm water ( see issue #290)

No further implementations are needed here (see this comment), so I'll merge this PR now.