Ensure complete set of carriers

[FabianHofmann]

We should ensure that all carriers, that are used in the network, are actually listed in n.carriers with nice_name and color.

For the set of existent carriers use set.union(*[c.df.get("carrier", []) for c in n.iterate_components()])

[euronion]

could be part of .check_consistency()?

[FabianHofmann]

yes, good idea

[virio-andreyana]

These are all carrier names from all components that is not included in n.carrier. As you can see, at least since the merger of pypsa-eur and pypsa-eur-sec, the term "carrier" has shifted away from meaning the energy carrier according to https://pypsa.readthedocs.io/en/latest/components.html#carrier into a way to categorize component with different properties.

Buses	Generators	Global Constraints	Lines	Links	Stores
AC	solar rooftop	AC, DC		BEV charger	H2 Store
DC	-	co2_absorptions	AC	DAC	battery storage
gas for industry	-	co2_emissions	-	DC	methanol
low voltage	-	-	-	Fischer-Tropsch	-
methanol	-	-	-	H2 Electrolysis	-
process emissions	-	-	-	H2 Fuel Cell	-
solid biomass for industry	-	-	-	H2 electrolysis	-
-	-	-	-	H2 fuel cell	-
-	-	-	-	H2 pipeline	-
-	-	-	-	H2 pipeline retrofitted	-
-	-	-	-	SMR	-
-	-	-	-	SMR CC	-
-	-	-	-	Sabatier	-
-	-	-	-	V2G	-
-	-	-	-	battery charger	-
-	-	-	-	battery discharger	-
-	-	-	-	biogas to gas	-
-	-	-	-	electricity distribution grid	-
-	-	-	-	gas for industry	-
-	-	-	-	gas for industry CC	-
-	-	-	-	gas pipeline	-
-	-	-	-	helmeth	-
-	-	-	-	home battery charger	-
-	-	-	-	home battery discharger	-
-	-	-	-	methanolisation	-
-	-	-	-	process emissions	-
-	-	-	-	process emissions CC	-
-	-	-	-	residential rural biomass boiler	-
-	-	-	-	residential rural gas boiler	-
-	-	-	-	residential rural ground heat pump	-
-	-	-	-	residential rural resistive heater	-
-	-	-	-	residential rural water tanks charger	-
-	-	-	-	residential rural water tanks discharger	-
-	-	-	-	residential urban decentral air heat pump	-
-	-	-	-	residential urban decentral biomass boiler	-
-	-	-	-	residential urban decentral gas boiler	-
-	-	-	-	residential urban decentral resistive heater	-
-	-	-	-	residential urban decentral water tanks charger	-
-	-	-	-	residential urban decentral water tanks discharger	-
-	-	-	-	services rural biomass boiler	-
-	-	-	-	services rural gas boiler	-
-	-	-	-	services rural ground heat pump	-
-	-	-	-	services rural resistive heater	-
-	-	-	-	services rural water tanks charger	-
-	-	-	-	services rural water tanks discharger	-
-	-	-	-	services urban decentral air heat pump	-
-	-	-	-	services urban decentral biomass boiler	-
-	-	-	-	services urban decentral gas boiler	-
-	-	-	-	services urban decentral resistive heater	-
-	-	-	-	services urban decentral water tanks charger	-
-	-	-	-	services urban decentral water tanks discharger	-
-	-	-	-	solid biomass for industry	-
-	-	-	-	solid biomass for industry CC	-
-	-	-	-	urban central air heat pump	-
-	-	-	-	urban central gas CHP	-
-	-	-	-	urban central gas CHP CC	-
-	-	-	-	urban central gas boiler	-
-	-	-	-	urban central resistive heater	-
-	-	-	-	urban central solid biomass CHP	-
-	-	-	-	urban central solid biomass CHP CC	-
-	-	-	-	urban central water tanks charger	-
-	-	-	-	urban central water tanks discharger	-