Allow to build multi-level design of experiments

[dumoulin]

With the core of SimExplorer, we can build complex DoE, and particularly nested DoE. It is the case when you want to explore some factors with a plan method and some other factors with an other plan method. But, for a convenient purpose, it will be better solution to present these different methods in the same "exploration loop". I propose to display a list of panels in the configuration of the ExplorationLoop component. The user can add and order the method used for the exploration, and select the factors associated to each method. For example:

Exploration Loop Configuration Panel
____________
Complete plan (a1,a2)
[ Configuration of the method ]
____________
LHS plan (a3,a4)
[ Configuration of the method ]

[romain.reuillon]

The solution is to implement a composite plan made of several exploration plans, composing each value of the first plan with all the others. I think it is trivial to do.

[dumoulin]

Yes, it is trivial at API level, but we need also an ergonomic form for the GUI :-)