[LMS-1002] implemented editing group description, removed group leader and parent

...enbis/generic/client/web/client/ICommonClientService.java

.../generic/client/web/client/ICommonClientServiceAsync.java

...d/openbis/generic/client/web/client/application/Dict.java

...neric/client/web/client/application/model/GroupModel.java

.../web/client/application/model/ModelDataPropertyNames.java

...s/generic/client/web/client/application/ui/GroupGrid.java

.../client/web/client/application/ui/amc/AddGroupDialog.java

...ient/application/ui/columns/specific/GroupColDefKind.java

...msx/cisd/openbis/generic/client/web/client/dto/Group.java

...penbis/generic/client/web/server/CommonClientService.java

...ch/systemsx/cisd/openbis/generic/server/CommonServer.java

...temsx/cisd/openbis/generic/server/CommonServerLogger.java

...emsx/cisd/openbis/generic/server/business/bo/GroupBO.java

...msx/cisd/openbis/generic/server/business/bo/IGroupBO.java

...h/systemsx/cisd/openbis/generic/shared/ICommonServer.java

.../cisd/openbis/generic/shared/basic/dto/IGroupUpdates.java

.../ch/systemsx/cisd/openbis/generic/shared/dto/GroupPE.java

openbis/source/sql/generic/039/schema-039.sql

...bis/source/sql/postgresql/migration/migration-038-039.sql

...ystemsx/cisd/openbis/generic/server/CommonServerTest.java