xflow 0.1.1

XFlow implementation
Documentation 
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{
  "id": "add_1",
  "name": "add_1",
  "version": 1,
  "requirements": [
    {
      "xtype": "flow",
      "version": 1
    },
    {
      "xtype": "flox",
      "version": 1
    }
  ],
  "variables" : {
    "input" : [
      {
        "name"  : "CounterValue",
        "vtype"  : "number",
        "value" : "0"
      }
    ],
    "output" : [
      {
        "name" : "CounterValue",
        "vtype" : "number"
      }
    ],
    "local" : [
    ]
  },
  "nodes": [
    {
      "id": 1,
      "nodetype": "flow",
      "action": "start",
      "label" : "Start",
      "parameters": {}
    },
    {
      "id": 2,
      "nodetype": "flox",
      "action": "evalexpr",
      "label" : "Flox",
      "parameters": {
        "expression" : "$CounterValue+1",
        "returns"    : {
          "name"   : "CounterValue",
          "vtype"   : "number"
        }
      }
    },
    {
      "id": 3,
      "nodetype": "flow",
      "action": "end",
      "label" : "End",
      "parameters": {}
    }
  ],
  "edges": [
    [ 1, 2 ],
    [ 2, 3 ]
  ],
  "branches" : [
  ]
}