added additional flags and propagated to launchers

Tobias Müllerrequested to merge
launcher_flags into main

Created by: dominikkiese

launch! has two more boolean flags parquet and Σ_corr which default to true. With these, parquet iterations to initialize the FRG flow as well as self-energy corrections in multiloop runs can be turned if wanted. However, this is not recommend (therefore both arguments default to true).

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