Units standardization in the datamodel

[JosePizarro3]

@CagtayFabry pointed out that there is a standard way of defining units using [<unit>] in the property_label:

I have a question wrt the indication of units in property_label. @JosePizarro3
The Wiki still mentions the indication of units using a [mm/s] style syntax for property_label. Should we still follow this or is it obsolete?

I don't think it is covered in the Masterdata checker currently

Thanks for that, Cagtay! I will say we keep it like this.

I will then:

• Fix the new properties labels defined by @BjoernMie in New object type: particle size analysis by laser diffraction methods #233
• Add also the possibility of an units attribute in PropertyTypeAssignment. This will be use for an alternative to add this in property_label. I will use pint implementation, and download the default_en.txt for our repo and store it in datamodel/
• Backlog: update the checker to check consistency of the units (either in property_label or in units) #245