Fix o3max

[dulte]

Makes it so that the obs readers read o3max as o3. It is not a perfect fix, but at least a fix.

It works with EBAS

[codecov]

Codecov Report

Merging #627 (668a3b0) into main-dev (5c6334b) will decrease coverage by 0.03%.
The diff coverage is 33.33%.

@@             Coverage Diff              @@
##           main-dev     #627      +/-   ##
============================================
- Coverage     76.94%   76.90%   -0.04%     
============================================
  Files            98       98              
  Lines         17635    17649      +14     
============================================
+ Hits          13569    13573       +4     
- Misses         4066     4076      +10     

Flag	Coverage Δ
unittests	76.90% <33.33%> (-0.04%)	⬇️

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Impacted Files	Coverage Δ
pyaerocom/aeroval/glob_defaults.py	100.00% <ø> (ø)
pyaerocom/io/read_ebas.py	88.08% <ø> (ø)
pyaerocom/io/read_mscw_ctm.py	95.08% <ø> (ø)
pyaerocom/aux_var_helpers.py	57.89% <9.09%> (-3.81%)	⬇️
pyaerocom/io/read_eea_aqerep_base.py	55.20% <100.00%> (+0.42%)	⬆️

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[WillemVanCaspel]

Very talented programmer!

[WillemVanCaspel]

This is even better!

[avaldebe]

why change the order?

[avaldebe]

what is the plan for reading plain O3 as O3?