Remove dead c code

[mferrera]

These functions are not used and probably will not be used.

[codecov-commenter]

Codecov Report

Merging #980 (90c3808) into main (fb8d9af) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #980   +/-   ##
=======================================
  Coverage   80.30%   80.30%           
=======================================
  Files          92       92           
  Lines       13494    13494           
  Branches     2227     2227           
=======================================
  Hits        10837    10837           
  Misses       1930     1930           
  Partials      727      727           

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[jcrivenaes]

Some of the functions were prototypes of ideas I would like to continue at some point, e.g. grd3dp_import_import_xtgeo_grid_grid.c. The goal is the get a very fast format for cloud services (SUMO) with metadata, but the ideas halted due to focus shift at some point.

I agree that this is (import) not in use, while the export counterpart grdcp3d_export_xtgeo_grid.c is not removed in this PR, so you need to remove this also.

In datamodels.rst the XTGeo binary format is also mentioned for 3D grid geometry (line 209), so in case these are removed, you need to change this doc also.

[jcrivenaes]

Some edit: Perhaps keep the documentation part, as I can see export_xtgcpgeom in _grid_export.py do a "xtgeo" export but not via C, but via pure python. Sorry for introducing confusion, @mferrera

[mferrera]

Thanks, I missed the export file

[jcrivenaes]

LGTM