Remove a useless test

The two tests (testDeleteWork and testDeleteWorkWithNoCopies) are
 testing the same thing (deleteWork), but one of them loops over
 'copies' populated by the getCopies() method, which returns nothing, so
 the loop never gets run.  The two tests are the same.
Add internalAccessConditions to node. Remove accessRestrictions from work. Add more comments.
Bump version
Merge pull request #132 from nla/ti_property_changes

merged.
Merge pull request #129 from nla/hr-rm-uselesstest

Remove a useless test
Merge branch 'master' into hr-filechanges
bump version