fix: return family name in glmDS2 result

[ymarcon]

Fix for #465, glmDS2 only.

The returned value in JSON is now

{
  "server1": {
    "family": "binomial",
    "info.matrix": [
      [
        433,
        216.5,
        11854.745,
        680.874629249998
      ],
      [
        216.5,
        216.5,
        5813.9525,
        351.703075
      ],
      [
        11854.745,
        5813.9525,
        334837.6683,
        18532.8212879925
      ],
      [
        680.874629249998,
        351.703075,
        18532.8212879925,
        1144.17968050697
      ]
    ],
    "score.vect": [
      [
        -842
      ],
      [
        -424
      ],
      [
        -22985.76
      ],
      [
        -1327.9215585
      ]
    ],
    "numsubs": 1732,
    "dev": 2401.06183345965,
    "Nvalid": 1732,
    "Nmissing": 431,
    "Ntotal": 2163,
    "disclosure.risk": 0,
    "errorMessage2": "No errors"
  }
}

[StuartWheater]

Passed tests and checks.
No docs changes needed.