Merge branch 'release/0.5.4' into develop
New user manual sections about geo layers configuration
New user manual sections about data sets configuration
New dataset source: "shape". Now also the dataset embedded in geolayer can be used
Data attribute of geolayer features is called now "_data" instead of simply "data"
User manual update about new dataset source "shape"
Fix bug in _data attribute renaming
Merge branch 'feature/dataset-in-geolayer' into develop
Fix bug in groups management in the schema of a dataset
Fix bug in groups definition and varMenu
New release 0.5.5 with new shape data source
Merge branch 'release/0.5.5'