[LMS-634] remove: - 'AbstractAttachmentPE' and 'FileAttachmentPE'.

...client/web/client/application/framework/MainTabPanel.java

...cisd/openbis/generic/shared/dto/AbstractAttachmentPE.java

...ystemsx/cisd/openbis/generic/shared/dto/AttachmentPE.java

.../systemsx/cisd/openbis/generic/shared/dto/Experiment.java

...ystemsx/cisd/openbis/generic/shared/dto/ExperimentPE.java

...msx/cisd/openbis/generic/shared/dto/FileAttachmentPE.java

openbis/source/java/hibernateContext.xml

...ric/client/web/client/application/ui/amc/CreateGroup.java

...ic/client/web/client/application/ui/amc/CreatePerson.java

...eric/client/web/client/application/ui/amc/CreateRole.java