fix obsolete classes display

[syphax-bouazzouni]

In AgroPortal, for the ontology SeaDataNet Device Thesaurus, all the terms are displayed as obsolete (in grey) even if the backend returned the obsolete property as false.

Example

The class "SeaDataNet sample collector categories", we see in the backed (https://data.agroportal.lirmm.fr/ontologies/SDNDEV/classes/http%3A%2F%2Fvocab.nerc.ac.uk%2Fcollection%2FL21%2Fcurrent%2FICAT01%2F?display=all) that the obsolete property is "false"

But in the UI, it is shown as "true"

[syphax-bouazzouni]

I suppose that the issue is that "false" is read in the UI as a String and not parsed to a boolean when the test is done to say if obsolete or not. ("false" is true in a condition)

@SirineMhedhbi Could you fix this issue and do your PR against the master branch?

[syphax-bouazzouni]

OK, so this was a more complex issue than we thought.

There are two issues:

• Issue 1: Parsing string obsolete values to boolean, fixed with this Fix: bug of obsolete class ontologies_api_ruby_client#13

But even with this fix the concept remained in grey, because of the second issue described below in the screenshot

• Issue 2: SeaDataNet concepts don't define the inScheme property, and we display concepts not in the currently selected scheme in grey.
  With Fix: AGROVOC concept seed not displaying and a better handling of concept not in a scheme information #355, we added an information text to inform users that those concept in grey are not in a scheme,

to make this works two fixes were made in the backend ontoportal-lirmm/ontologies_api#50 and ontoportal-lirmm/ontologies_linked_data#101