Title : Define track

Discussion Sébastien Le Digabel about Speculative search in MADS algorithm:

• Speculative search uses fixed parameters (for each iteration of search) BASEFACTOR = 4.0 (stepLength) and SEARCHMAX = 1 (number of points generated along the direction).
• MADS algorithm iterates on Search and Poll (if search step fails). If search step succeeds, MADS skips Poll and iterates directly on search (especially speculative method which in this case extends to a “line search”) until termination criteria.

ToDo: