remove smoother_mod

[hkershaw-brown]

The smoother mod is not functional in DART Manhattan.

Downside: It will require removing my favourite line of code in dart:

Upsides:

• Removes unneeded and potentially confusing logic in filter_mod.

• There are people using the smoother, who are using Lanai. For prototyping a Manhattan smoother, it would be good to remove the dead smoother code.

• We're not compiling a module that is never used every time we build filter.

[hkershaw-brown]

https://github.com/NCAR/DART/tree/smooth-remove

Note on mass removing nameslist from input.nmls find . -name input.nml -exec sed -i '' '/^&smoother_nml/,/\//d' input.nml {} \;

[hkershaw-brown]

This is an aside but I don't think lorenz_96_tracer_advection filter_input.cdl needs a copy of the namlist in the cdl file