Add option to grdpaste to only report the "pasting" side. #7368
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The problem this PR tries to address is that
grdpaste
does not works for externals that pass in GMTgrid objects. That is so because those structs already have the grid arrays with normal (or zero) padding but thegrdpaste.c
does quite some trickery with the pads to read the A and B grids directly on their final position in output array. So, the best is really to re-implement the matrix pasting in Julia or Matlab, which is a simple operation. But for that we must know how-to-paste and that's where the info returned by the new -S is important.