Added session support, but right now it is defaulting to 2 week long session

Reports working:
 Ledger
 Balance Sheet
 Profit & Loss
 Closing Stock

overlord/src/app/profit-loss/profit-loss.service.ts

@@ -21,14 +21,9 @@ export class ProfitLossService {
   }
 
   list(startDate: string, finishDate): Observable<ProfitLoss> {
-    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<ProfitLoss>>this.http.get<ProfitLoss>(url, options)
+    startDate = startDate ? `/${startDate}` : '';
+    finishDate = finishDate ? `/${finishDate}` : '';
+    return <Observable<ProfitLoss>>this.http.get<ProfitLoss>(`${url}${startDate}${finishDate}`)
       .pipe(
         catchError(this.log.handleError(serviceName, 'list'))
       );