1-01-01 deprecate inapplicable and unknown

[fstuerzl]

Branch

https://github.com/wmo-im/wmds/tree/Issue196

Summary and Purpose
Deprecate elements that make no sense from code table for observed variables.

Proposal
Deprecate entries "inapplicable" and "unknown" from code table 1-01-01.csv.

Reason
The elements "inapplicable" and "unknown" refering to the observed variable do not make sense in this context as there would be no observation to be described if the variable cannot be defined. While a nilReason makes a lot of sense in many code lists, this one is so fundamental that additional entries in the code table are required in case the existing elements are insufficient. Specifying a nilReason does not generate any meaningful information here.

[amilan17]

Decision dependent on #199.

[joergklausen]

@fstuerzl Create branch, expand on the reason

[fstuerzl]

Branch: https://github.com/wmo-im/wmds/blob/Issue196/tables_en/1-01-01.csv

[joergklausen]

Unknown and Invalid marked as invalid. Confirmed that branch is correct.

[fstuerzl]

@RMaerz, @tomkralidis, please review the proposal and confirm or comment.

[RMaerz]

confirm !