added VersionValue
added LastModificationTimestampValue
added LastModificatorValue
create primary key contraints for data tables
refactored and added docs.
fixed docs.
create index for last modification col
create default indexes.
made presence of housekeeping values mandatory.
refactored.
added LabelValue
added NotNullConstraint
fixed wrong assignment
cleanup
cleanup
IdentityValue must be set.
LastModificationTimestampValue must be set.
LastModificatorValue must be set.
VersionValue must be set.
LabelValue must be set.