[Gmsh] remove additional info for nodes and elements from .msh file

[Marios Papadopoulos]

I have created one *mygeometry.geo* file which contains points, lines,
circles (with additional helping nodes to define arcs), line loops,
surfaces, and a recombine surface definitions in 2D. From command line, I
can create with *gmsh -2 mygeometry.geo *the desired mesh with
quadrilateral elements. The aforementioned command will produce *
mygeometry.msh*. Is there any option, to remove additional nodes (used only
for geometry purposes) from *$Nodes* block, and also all the elements
marked with labels "15" and "1" (points and 1D line elements
correspondigly) in *$Elements* block of .msh file? I need only "pure" mesh
nodes and pure quad elements in msh file.

Thanks in advance!
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