Greatly improve the original maregrams function (that downloads Tide Gauge data).

[joa-quim]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 88.57143% with 4 lines in your changes missing coverage. Please review.

Project coverage is 85.79%. Comparing base (230ff41) to head (88c2d30).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/maregrams.jl	88.57%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1672      +/-   ##
==========================================
+ Coverage   85.77%   85.79%   +0.01%     
==========================================
  Files         157      157              
  Lines       22035    22055      +20     
==========================================
+ Hits        18901    18922      +21     
+ Misses       3134     3133       -1     

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