Fixes for geosolutions-it/crop-information-portal#66

Read crop id for:

* Map generation on crop data and report widgets
* Chart generation on crop data and report widgets

instead the crop label. Now we can change the label on the admin system.
Merge pull request #297 from alediator/issue_66_crop_name_label

Fixes for geosolutions-it/crop-information-portal#66
Merge branch 'C013N' into C013N2