If we use transmissibilities for loadbalancing, then we calculate
transmissibilities twice. First on the global grid before
loadbalancing and then on the local grid after that. This is the
default. In this case all warnings will be shown correctly when
calculating the global transmissibilities.
If the user requests the same weights for all faces (command line
parameter --edge-weights-method=0) then the transmissibilities are only
calculated on the loadbalanced grid. Unfortunately, in this case only
rank 0 will issue warnings for his part including the false positives
mentioned below.
Due to load balancing many NNCs might be stored on another process,
but we still use all EDITNNC entries when computing transmissibilties
locally. Hence when applying EDITNNC on the loadbalanced grid we
will issue warnings for cases where there are no problems (e.g. NNC
between two overlap cells.
With this PR we will only warn when computing the transmissibilities
for the first time. For the default settings this will remove spurious
and duplicate warnings.
Not that for --edge-weights-method=0 nothing changes and we will still
see only warnings for the first rank including spurious one.
