Make the Instance-Variable Coclustering Inner Variables API More Easily Discoverable

[popescu-v]

Currently, khiops.core.coclustering_results.CoclusteringDimension.variable_part_dimensions can be used to retrieve the CoclusteringDimensions associated to the inner variables, as it holds the variable part instance-variable CoclusteringDimensions that are inner to each CoclusteringDimension.

However, this attribute is not easy to find, because:

• its name is far away from the innerVariables coclustering report field;
• it is sparsely documented.

Hence, the goal of this issue is two-fold:

• rename variable_part_dimensions to inner_variable_dimensions
• add more documentation of this attribute, with an introductory explanation of the instance-variable coclustering, in order to best situate this attribute in the instance-variable coclustering context.