[LMS-1929] added support for genes with multiple symbols

...java/ch/systemsx/cisd/etlserver/PlateDimensionParser.java

...cisd/openbis/generic/server/business/bo/AttachmentBO.java

...cisd/openbis/generic/server/util/KeyExtractorFactory.java

...stemsx/cisd/openbis/generic/shared/util/EntityHelper.java

...n/screening/client/web/server/ScreeningClientService.java

...nbis/plugin/screening/server/LibraryRegistrationTask.java

...cisd/openbis/plugin/screening/server/ScreeningServer.java

...penbis/plugin/screening/server/ScreeningServerLogger.java

...isd/openbis/plugin/screening/shared/IScreeningServer.java

...bis/plugin/screening/shared/dto/PlateDimensionParser.java

.../plugin/screening/server/LibraryRegistrationTaskTest.java