jeankpf

### Question Hi there, the documentation specifies that the reflective BC are identical to the outflow BC, except for the normal component of the velocity field which is systematically reversed....

Hello there, I noticed a weird line in the AddNonIdealMHDFlux function of the current master branch. https://github.com/idefix-code/idefix/blob/158f2aa3a35148bb2a992ae24bb8f813a5965034/src/fluid/addNonIdealMHDFlux.hpp#L261 I think it should rather be something like: ` localdmax += eta; `...

### Describe the issue: The variable haveInitFlow and haveOutput have been confused in the following line, resulting in the impossible initialisation of the flow with a python function without the...