SP-183, BIS-91: done including unit tests.

...d/openbis/dss/generic/server/plugins/standard/Copier.java

...is/dss/generic/server/plugins/standard/DataSetCopier.java

...eneric/server/plugins/standard/DataSetCopierForUsers.java

...eric/server/plugins/standard/IImmutableCopierFactory.java

...neric/server/plugins/standard/ImmutableCopierFactory.java

...ic/server/plugins/standard/DataSetCopierForUsersTest.java

...ss/generic/server/plugins/standard/DataSetCopierTest.java