SSDM-7398: frozen_for concept added and system tested

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

...a/ch/systemsx/cisd/openbis/generic/shared/dto/DataPE.java

...isd/openbis/generic/shared/dto/DataSetRelationshipPE.java

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

...h/systemsx/cisd/openbis/generic/shared/dto/ProjectPE.java

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

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

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

openbis/source/sql/generic/173/schema-173.sql

openbis/source/sql/postgresql/173/function-173.sql

...bis/source/sql/postgresql/migration/migration-172-173.sql

.../sis/openbis/systemtest/freezing/DataSetFreezingTest.java

...ing/ExperimentSampleDataSetRelationshipsFreezingTest.java

...ch/ethz/sis/openbis/systemtest/freezing/FreezingTest.java

.../ch/ethz/sis/openbis/systemtest/freezing/FrozenFlags.java

.../freezing/ProjectExperimentRelationshipsFreezingTest.java

.../sis/openbis/systemtest/freezing/ProjectFreezingTest.java

...z/sis/openbis/systemtest/freezing/SampleFreezingTest.java

...ezing/SpaceExperimentSampleRelationshipsFreezingTest.java

...hz/sis/openbis/systemtest/freezing/SpaceFreezingTest.java