Improve the weblab-portlet filter to inject Document during the event phase
In many portlets that render a WebLab document, the business code that load the resource from the respository service by reading the exchanged POK is duplicated. Moreover the portlet controller is more complex (more events to process) and the repository service is called by each portlet for the same resource. Add a Document injection mechanism in the weblab portlet filter should be a relevant approach to avoid duplicate service call and duplicate business code.