Handler Average extend to arbitrary lattice

[lisataldir]

I added a handler for arbitrary lattice

[llaniewski]

Hi, @lisataldir,

I would like to ask you to redo this PR, not promoting code to R-templates. The necessary information you need (to loop over fields and select the ones to average) is provided in the model structure (see https://github.com/CFD-GO/TCLB/blob/develop/src/Lists.cpp.Rt), so you can make this loop in C++. You can see an example here:

TCLB/src/CartLattice.cpp.Rt

Line 629 in c6b1675

for( const Model::Field& f : model->fields ) {

Best,