Added axes serialization to json for export

[tischi]

No description provided.

[btbest]

Oh boy we've had this neat feature sitting around for ages 🤦

I think it looks good - though I didn't bother to actually compile and try it now 😶

ilastik's own hdf5 image export includes two more keys in the axistags json: `

"axes": [
    {
      "key": "y",
      "typeFlags": 2,
      "resolution": 0,
      "description": ""
    },
    //...
]

These are 0 and "" for all axes in the example I exported, so I would assume they are optional.

[k-dominik]

Thank you for having a look @btbest

regarding your question on missing resolution and description - these are optional (default parameters for AxisInfo construction are in place).

test script

import vigra

atjson = """
{
   "axes":
   [
      {
         "key": "y",
         "typeFlags": 2
      }
   ]
}
"""
print(vigra.AxisTags.fromJSON(atjson)["y"].resolution)

So yes, the current code only adds the axis info required for ilastik to interpret it correctly.

[k-dominik]

thx @tischi!!!