[atlas] Create new measurement from old measurment

We don’t really have a means of a completely /copying/ a measurement,
but we do allow for re-selection of probes used for a previous
measurement. In other words:


      Using the UI

  * Go to Create a new measurement
    <https://atlas.ripe.net/measurements/form/>
  * Define the same parameters (packets, size, etc.) as your older
    measurement
  * Select “Reuse a set from an old measurement”
  * In the window that appears, type in the measurement id you wish to
    duplicate and then give the number of probes you want to use from
    that selection. To use all of them, you must give the total number
    of probes in that measurement.


      Using the API

This is a lot easier, as you simply have to modify the |probes| value in
your POST request.

Say for example that your original measurement looked like this:

| {
  "definitions": [
   {
    "target": "example.com",
    "af": 6,
    "packets": 3,
    "size": 48,
    "description": "Ping measurement to example.com",
    "interval": 240,
    "resolve_on_probe": false,
    "type": "ping"
   }
  ],
  "probes": [
   {
    "type": "area",
    "value": "WW",
    "requested": 50
   }
  ],
  "is_oneoff": false
 }
|

Assuming that the old measurement had id |123456789|, The new one would
be a near-copy save for the |probes| section:

| {
   "definitions": [
    {
     "target": "example.com",
     "af": 6,
     "packets": 3,
     "size": 48,
     "description": "Ping measurement to example.com",
     "interval": 240,
     "resolve_on_probe": false,
     "type": "ping"
    }
   ],
   "probes": [
    {
     "type": "msm",
     "value": "123456789",
     "requested": 50
    }
   ],
   "is_oneoff": false
 }
|

Note however that like every measurement you create, there’s no way to
guarantee that every probe you request will be available. Especially for
one-offs, if the probe is down or overly busy, such selected probe(s)
won’t be allocated to your measurement.

​
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