resolves: 152 support complex scalability json files

[JavierCladellas]

• Closes Support complex scalability JSON files #152

• Support specifying single path: "variables_path":"my.path.to.variable" that will yield {"variable":x}

• Support lists: "variables_path":["execute","postprocess.*","simulation.*"]

• If the resulting json is nested, it will be flattened. e.g. if the field my.variable contains {"x":1,"y":2}, the performance variables will be named variable.x and variable.y

Concrete example:
To extract the performance variables of the following JSON

{
    "execute": 7.276617949,
    "postprocess": {
        "outputs": 0.24561935600000004,
        "postprocess": 3.5976664250000003,
        "report": 0.0,
        "vizualisation": 3.1949894540000003
    },
    "simulation": {
        "heatTransfer": 1.1842422940000004,
        "simulation": 3.677921673,
        "solarMasks": 2.4920894700000003
    }
}

We can have

"stages": [
    {
        "name":"",
        "file": "instances/np_32/logs/timers.json",
        "format": "json",
        "variables_path":["execute", "postpocess.*","simulation.*"]
    }
]

Which will give

"execute": 7.276617949,
"outputs": 0.24561935600000004,
"postprocess": 3.5976664250000003,
"report": 0.0,
"vizualisation": 3.1949894540000003,
"heatTransfer": 1.1842422940000004,
"simulation": 3.677921673,
"solarMasks": 2.4920894700000003

Or if we provide just:

"stages": [
    {
        "name":"",
        "file": "instances/np_32/logs/timers.json",
        "format": "json",
        "variables_path":["*"]
   }
]

We would have

"execute": 7.276617949,
"postprocess.outputs": 0.24561935600000004,
"postprocess.postprocess": 3.5976664250000003,
"postprocess.report": 0.0,
"postprocess.vizualisation": 3.1949894540000003,
"simulation.heatTransfer": 1.1842422940000004,
"simulation.simulation": 3.677921673,
"simulation.solarMasks": 2.4920894700000003

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