tank_design: Updated year in header

tank_design/src/datapostprocessing.py

tank_design/src/datapreprocessing.py

tank_design/src/readlayertext.py

...tank_design_tu_berlin/general/calculatecenterofgravity.py

...ll_functions/_00_readenergycarrierandtankconfiguration.py

...rlin/general/call_functions/_01_checktankconfiguration.py

...rlin/general/call_functions/_02_preparegeometricaldata.py

...pirical/tank_design_tu_berlin/general/methodhtmlreport.py

...ing/empirical/tank_design_tu_berlin/general/methodplot.py

...mpirical/tank_design_tu_berlin/general/methodtexoutput.py

...mpirical/tank_design_tu_berlin/general/methodxmlexport.py

...rical/tank_design_tu_berlin/general/tankdesigntuberlin.py

...mpirical/tank_design_tu_berlin/kerosene/calculatetanks.py

...mpirical/tank_design_tu_berlin/kerosene/methodkerosene.py

..._design_tu_berlin/liquid_hydrogen/calculateconicaltank.py

...ign_tu_berlin/liquid_hydrogen/calculatecylindricaltank.py

...n_tu_berlin/liquid_hydrogen/calculateparametercylinder.py

...ign_tu_berlin/liquid_hydrogen/calculateparameterendcap.py

...berlin/liquid_hydrogen/calculateparametertruncatedcone.py

...esign_tu_berlin/liquid_hydrogen/calculatethicknesswall.py