[LMS-634] add: - 'AttachmentContentPE' and new DB script 028.

...is/generic/server/dataaccess/db/DatabaseCreationUtil.java

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

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

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

...emsx/cisd/openbis/generic/shared/dto/ByteArrayBridge.java

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

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

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

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

...x/cisd/openbis/generic/shared/dto/ValidationMessages.java

openbis/source/java/hibernateContext.xml

openbis/source/sql/generic/028/data-028.sql

openbis/source/sql/generic/028/schema-028.sql

openbis/source/sql/postgresql/028/function-028.sql

...bis/source/sql/postgresql/migration/migration-027-028.sql

openbis/sourceTest/sql/postgresql/028/.DUMP

...ceTest/sql/postgresql/028/001=controlled_vocabularies.tsv

...st/sql/postgresql/028/002=controlled_vocabulary_terms.tsv

openbis/sourceTest/sql/postgresql/028/003=data.tsv

openbis/sourceTest/sql/postgresql/028/005=data_set_types.tsv