[LMS-956] added '(ALL)' Experiment Type (not selected automatically)

...ent/web/client/application/model/ExperimentTypeModel.java

...t/application/ui/experiment/ExperimentBrowserToolbar.java

...lication/ui/experiment/ExperimentTypeSelectionWidget.java

...d/openbis/generic/server/business/bo/ExperimentTable.java

...isd/openbis/generic/server/dataaccess/IExperimentDAO.java

...d/openbis/generic/server/dataaccess/db/ExperimentDAO.java

...msx/cisd/openbis/generic/shared/basic/dto/EntityType.java