Replace, in _base_ codes, calls to GMT by module name with gmt(...)

[joa-quim]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 66.66667% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.06%. Comparing base (e1948cd) to head (2c11a0d).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/MB/mbgetdata.jl	0.00%	1 Missing ⚠️
src/MB/mbimport.jl	0.00%	1 Missing ⚠️
src/MB/mblevitus.jl	0.00%	1 Missing ⚠️
src/MB/mbsvplist.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1829      +/-   ##
==========================================
+ Coverage   85.95%   86.06%   +0.11%     
==========================================
  Files         173      173              
  Lines       25910    25913       +3     
==========================================
+ Hits        22271    22303      +32     
+ Misses       3639     3610      -29     

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