Moved to Angular 6.0

----

Pending
* Table width for the points column in incentive
* Linting
* keyboard navigation where it was used earlier
* can remove the unused totals calculated serverside in productledger
* spinner and loading bars
* Activate Guard for Employee Function tabs
* Progress for Fingerprint uploads
* deleted reconcile and receipe features as they were not being used
* focus the right control on component load

overlord/src/app/purchase-entries/purchase-entries.service.ts

@@ -0,0 +1,37 @@
+import {Injectable} from '@angular/core';
+import {catchError} from 'rxjs/operators';
+import {Observable} from 'rxjs/internal/Observable';
+import {HttpClient, HttpHeaders, HttpParams} from '@angular/common/http';
+import {PurchaseEntries} from './purchase-entries';
+import {ErrorLoggerService} from '../core/error-logger.service';
+
+const httpOptions = {
+  headers: new HttpHeaders({'Content-Type': 'application/json'})
+};
+
+const url = '/api/PurchaseEntries';
+const serviceName = 'PurchaseEntriesService';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class PurchaseEntriesService {
+
+  constructor(private http: HttpClient, private log: ErrorLoggerService) {
+  }
+
+  list(startDate: string, finishDate): Observable<PurchaseEntries> {
+    const options = {params: new HttpParams()};
+    if (startDate !== null) {
+      options.params = options.params.set('s', startDate);
+    }
+    if (finishDate !== null) {
+      options.params = options.params.set('f', finishDate);
+    }
+    return <Observable<PurchaseEntries>>this.http.get<PurchaseEntries>(url, options)
+      .pipe(
+        catchError(this.log.handleError(serviceName, 'list'))
+      );
+  }
+
+}