resolves : 97 add custom cpu parametrization

[JavierCladellas]

• Closes #97

Changed the parameters syntax. Supported modes are:

"linspace":{
  "min": 0.03,
  "max": 0.05,
  "n_steps": 3
}

"logspace":{
  "min": 0.03,
  "max": 0.05,
  "n_steps": 3,
  "base":10
}

"geometric":{
  "start": 8,
  "ratio": 2,
  "n_steps": 3
}

"range":{
  "min": 0.03,
  "max": 0.05,
  "step": 0.01
}

"sequence":[0.03,0.04,0.05]

"repeat":{
  "value":64
  "count"5
}

Added a "zip" parameter concept that allows to zip multiple sub-parameters given any of the previous generators :

        {
            "name": "nb_tasks",
            "zip": [
                {
                    "name":"tasks",
                    "geometric":{
                        "start":16,
                        "ratio":2,
                        "n_steps":4
                    }
                },
                {
                    "name":"nodes",
                    "sequence":[1,1,2,3]
                }
            ]
        }

The previous example will create : "nb_tasks":[{"tasks":16,"nodes":1},{"tasks":32,"nodes":1},{"tasks":64,"nodes":2},{"tasks":128,"nodes":3}]

The following (straightforward) syntax is also supported:

{
  "name": "nb_tasks",
  "sequence": [
      {"tasks" : 16, "nodes":1},
      {"tasks" : 32, "nodes":1},
      {"tasks" : 64, "nodes":2},
      {"tasks" : 128, "nodes":3}
  ]
}

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