Classification ensembles aren't aware of the classification positive class

[ehopf]

A created classification ensemble should use the positive class information provided by the included models. Otherwise only the default value is used by the ensemble.

Steps to reproduce: 1.) Define the positive class of the classification problem data (change it to a value, that is not the default value) 2.) Create few runs 3.) Create a solution ensemble 4.) -> the ensemble uses the positive class default value

[mkommend]

r12067: Fixed positive class value during ensemble solution creation.

[gkronber]

reviewed r12067, k, thx!

[mkommend]

r12279: Merged r12067 into stable.