In stackgrids, read first grid with GMT to get the coord vectors and remaining layers with GDAL.

[joa-quim]

This fixes potential coordinate problems in grids that GDAL refuses to see the geotransform.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 91.30435% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.31%. Comparing base (0db41e6) to head (d288d2a).
⚠️ Report is 3420 commits behind head on master.

Files with missing lines	Patch %	Lines
src/utils_types.jl	71.42%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #721      +/-   ##
==========================================
+ Coverage   90.88%   91.31%   +0.42%     
==========================================
  Files         109      109              
  Lines        9305     9312       +7     
==========================================
+ Hits         8457     8503      +46     
+ Misses        848      809      -39     

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