replace WORLD with ALL in used filter names

[jgriesfeller]

and using only one constant to store the value

[codecov]

Codecov Report

Merging #659 (3d3ebd8) into main-dev (82d4333) will increase coverage by 0.00%.
The diff coverage is 90.00%.

@@            Coverage Diff            @@
##           main-dev     #659   +/-   ##
=========================================
  Coverage     76.90%   76.91%           
=========================================
  Files            98       98           
  Lines         17647    17653    +6     
=========================================
+ Hits          13571    13577    +6     
  Misses         4076     4076           

Flag	Coverage Δ
unittests	76.91% <90.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pyaerocom/colocation.py	71.81% <ø> (ø)
pyaerocom/region.py	62.69% <75.00%> (+0.29%)	⬆️
pyaerocom/aeroval/coldatatojson_helpers.py	71.91% <83.33%> (+0.04%)	⬆️
pyaerocom/access_testdata.py	79.16% <100.00%> (ø)
pyaerocom/colocation_auto.py	81.88% <100.00%> (+0.02%)	⬆️
pyaerocom/config.py	83.39% <100.00%> (ø)
pyaerocom/filter.py	87.03% <100.00%> (+0.12%)	⬆️
pyaerocom/region_defs.py	100.00% <100.00%> (ø)

---

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[jgriesfeller]

@AugustinMortier as soon as you have finished your testing and can confirm that it's working for the web interface, I can start the review

[AugustinMortier]

I confirm that the web interface now supports ALL.

[avaldebe]

🏁🏎️ ready to merge