Add informal groups (as species-lists)

[DimEvil]

Vary analogue to add 'lifeform' in the spatial portal..
Can we add another 'lifeform button' but instead of the groups already described there we would like to add 'informal groups' or 'informele groepen'
Those 'informal groups' should be described in a similar JSON as the groups.json or subgroups.json --> informalgroups.json

An example of such an informal group is 'Dagvlinders' or 'Nachtvlinders' of 'Macro invertebraten'

[DimEvil]

I can/will create the JSON files needed

[StefanVanDyck]

Use species-list for this, as informal groups don't really rely on the taxonomic structure / rule, but are better represented using simple enumeration.