Update notes for submitted changes

* access policies: obey loan_self permission
* access policies: enforce control_system permission
* access policies: docs and release note
* access policies: use Twitter typeahead.js for groups and users
* access policies: user interface
* access policies: remove Shared and group admin privileges
* access policies: data model
* tests: merge test_system_take and test_system_available
Update notes for submitted changes

* Initial TaskLibrary unit tests.
* New unit tests setup for bkr.server.