reportService renamed to groupsService to reflect functionality

...eports/static/reports/app/controllers/groupsController.js

...eports/static/reports/app/controllers/reportController.js

...eb/reports/static/reports/app/directives/addReportItem.js

.../reports/static/reports/app/directives/saveReportItems.js

.../web/reports/static/reports/app/services/groupsService.js

beat/web/reports/templates/reports/report.html