add `problem_definition.from_features_identifier(all_feature_id)`

[casenave]

to mimick dataset.from_features_identifier(all_feature_id)

[xroynard]

the name of this method is not very explicit, what should it do ?

[casenave]

the name of this method is not very explicit, what should it do ?

It's for restricting a prob def to a subset of feature identifiers

[xroynard]

maybe, these would be more explicit:

• dataset.extract_dataset
• dataset.extract_sub_dataset
• dataset.extract_dataset_from_feature_identifiers
• dataset.extract_dataset_from_identifiers

same for ProblemDefinition:

• problem_definition.extract_problem_definition
• problem_definition.extract_sub_problem_definition
• problem_definition.extract_problem_definition_from_feature_identifiers
• problem_definition.extract_problem_definition_from_identifiers