Add full tags to 0.3 issues API JSON response

[flacombe]

Following discussion, this PR propose to extend the issues API response with not only elems ids but tags as well, just like in the geojson.

Currently stuck in the test because of i18n so it's currently draft

[flacombe]

Tests are fine on my local instance.
I've processed osmose_powerline analyser on france_rhone_alpes_haute_savoie and obtained a JSON for class 6, that contains elems/tags in the JSON full output

I recommend merging it after #540

[frodrigo]

You lost the custom max limit.

[flacombe]

Now that issues() relies on _issues() instead of query._gets(), I kept it at https://github.com/osmose-qa/osmose-frontend/pull/536/files#diff-207e11f1ac32911ffb416b8ab839fc02cb1dde93e94b5f4dea2515ffd51262b1R159

[frodrigo]

You add full=true to all the output. But the idea of having a such param is to avoid fetching/send too much data. I am unsure about that.

[flacombe]

It was already set to true for any output that relies on _issues():
https://github.com/osmose-qa/osmose-frontend/blob/master/api/issues.py#L245

I set it to true in many outputs because in my PR _issues() could be called with params.full=False