#121 ZoomToFeatures and ZoomToLayer: Add the possibility to add a buffer around the features
Merge branch 'feature/121_zoomToFeaturesWorker_add_buffer' into dev
#125 make the ShapeFeature thread safe and improve the properties cache
#125 introduce the list with the ordered feature service attributes. This allows to show the feature service attributes in the origin order/ Remove useless feature loading
#125 solve display problems of the attribute table
Merge branch 'bug/125_attribute_table' into dev
#126 ThemeLayerWidget: the visible/invisible switch does not work properly/Visibility of the elements of the popup menu
Merge branch 'bug/126_theme_layer_widget_visibility' into dev
#130 save the feature service options in the corresponding services
Merge branch 'feature/130_save_feature_service_options' into dev
#131 The ThemeLayerWidget should show, if the shape file of a shape file service does really exists.
Merge branch 'feature/131_shape_file_not_found' into dev