DB changes for the LMS-826, LMS-827 and LMS-828

...s/generic/server/dataaccess/db/DatabaseVersionHolder.java

...x/cisd/openbis/generic/shared/basic/dto/DataTypeCode.java

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

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

...stemsx/cisd/openbis/generic/shared/dto/SequenceNames.java

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

...openbis/generic/shared/dto/properties/EntityDataType.java

openbis/source/sql/generic/031/data-031.sql

openbis/source/sql/generic/031/schema-031.sql

openbis/source/sql/postgresql/031/function-031.sql

...bis/source/sql/postgresql/migration/migration-030-031.sql

openbis/sourceTest/sql/postgresql/028/finish-028.sql

openbis/sourceTest/sql/postgresql/029/finish-029.sql

openbis/sourceTest/sql/postgresql/030/finish-030.sql

openbis/sourceTest/sql/postgresql/031/.DUMP

...sourceTest/sql/postgresql/031/001=attachment_contents.tsv

openbis/sourceTest/sql/postgresql/031/002=attachments.tsv

...ceTest/sql/postgresql/031/003=controlled_vocabularies.tsv

...st/sql/postgresql/031/004=controlled_vocabulary_terms.tsv

openbis/sourceTest/sql/postgresql/031/005=data.tsv