Improve plots for deterministic inversions

[a2ray]

• use the add dummy subplot trick to add rows as in

  HiQGA.jl/src/CommonToAll.jl

  Line 1964 in 2517259

  function plotmanygrids(σ, X, Y, Z, zall; yl=[], xl=[],

• add in PLNI and sferics to soundings, do not plot if they are not provided, ingest as array of nothing in soundings