Improve the ecmwf function to deal with levlist variables.

[joa-quim]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 34.61538% with 85 lines in your changes missing coverage. Please review.

Project coverage is 85.61%. Comparing base (a10f86a) to head (331de75).

Files with missing lines	Patch %	Lines
src/extras/weather.jl	34.61%	85 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1721      +/-   ##
==========================================
- Coverage   85.77%   85.61%   -0.16%     
==========================================
  Files         167      167              
  Lines       23574    23655      +81     
==========================================
+ Hits        20220    20253      +33     
- Misses       3354     3402      +48     

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