Add multiple dataset versions

Add versioning to view multiple versions of a dataset:

• Backend updates:

  • index datasets in elasticsearch with index names datasetkey-version and datasetkey-groups-version
  • tiles directory structure is changed to contain dataset version as tiles/datasetkey/version/...
  • bitmaps directory structure is changed to contain dataset version as bitmaps/datasetkey/version/...

• Frontend updates:

  • update dataset model to add versions array and current for selected version of dataset
  • Fix routing on angular side, now dataset path is defined as /map/key/version
  • Add version dropdown to map dashboard view
  • Default version is set as latest which redirects to the latest indexed version of the dataset
  • Update map history to keep history for dataset key and dataset version
  • Add popper.js to scripts before bootstrap to make dropdown work correctly

cartolab-frontend/src/app/datasets/services/dataset.service.ts

@@ -21,9 +21,12 @@ export class DatasetService {
             .pipe(catchError(this.handleError('getting datasets')));
     }
 
-    getDataset(key: string) {
-        return this.http.get<Dataset>(`${this.datasetsUrl}${key}/`)
-            .pipe(catchError(this.handleError('getting dataset ' + key)));
+    /**
+      * Reads dataset data from the database.
+     **/
+    getDataset(key: string, version: string) {
+        return this.http.get<Dataset>(`${this.datasetsUrl}${key}/${version}`)
+            .pipe(catchError(this.handleError('getting dataset ' + key + '-' + version)));
     }
 
     searchFilterValues(dataset: Dataset, filterKey: string,
@@ -31,8 +34,9 @@ export class DatasetService {
         let params = new HttpParams();
         params = params.set(filterKey, filterValue);
         params = params.set('limit', limit);
-        return this.http.get<FilterValue[]>(`${this.datasetsUrl}${dataset.key}/filtervalues/`, { params: params })
-            .pipe(catchError(this.handleError('getting filter values for ' + dataset.key)));
+        return this.http.get<FilterValue[]>(`${this.datasetsUrl}${dataset.key}-${dataset.current}/filtervalues/`, { params: params })
+            .pipe(catchError(this.handleError('getting filter values for ' +
+		       dataset.key + '-' + dataset.current)));
     }
 
     searchFilterValuesByDistance(dataset: Dataset, filterKey: string,
@@ -41,13 +45,16 @@ export class DatasetService {
         params = params.set('filterKey', filterKey);
         params = params.set('distance', distance.toString());
         params = params.set('location', location);
-        return this.http.get<FilterValue[]>(`${this.datasetsUrl}${dataset.key}/filtervalues/`, { params: params })
-            .pipe(catchError(this.handleError('getting filter values for ' + dataset.key)));
+        return this.http.get<FilterValue[]>(`${this.datasetsUrl}${dataset.key}-${dataset.current}/filtervalues/`, { params: params })
+            .pipe(catchError(this.handleError('getting filter values for ' +
+				 dataset.key + '-' + dataset.current)));
     }
 
-    getDatasetStats(key: string) {
-        return this.http.get<{ [nature: string]: number }>(`${this.datasetsUrl}${key}/stats/`)
-            .pipe(catchError(this.handleError('getting stats for dataset ' + key)));
+    getDatasetStats(key: string, version: string) {
+        return this.http.get<{ [nature: string]: number }>(`${this.datasetsUrl}${key}-${version}/stats/`)
+            .pipe(catchError(this.handleError(
+		'getting stats for dataset ' + key + '-' + version
+	    )));
     }
 
     /**