[Feat]: allow for 1 dimensional vector variables

[ward-haegeman]

What do you want?

in fluid simulations, the velocity is a vector of dimension dim

vel1[cell][0] is not allowed if dim=1 and as a consequence the code is not dimensionally independent, we have to make two codes :
_one for the 1d case
_one for the multi-d case

Please allow the access of the 1-d velocity field by vel1[cell][0] instead of vel1[cell] only.

A possible usage

No response

A possible implementation

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Other informations

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