Began implementing the collections controller.  Stopped to implement restriction-based validation of relation specifications.
Forms, files and collections that are associated to restricted forms or files now automatically become restricted.  The collections controller has also been implemented and thoroughly tested except for its search functionality.
Collections search functionality tests have been implemented and everything appears to be working correctly.
Sources controller implemented with BibTeX data structure and validation as well as search functionality; and tested.
Fixed a test in test_sources and enforced the uniqueness of Source.key in the model.
Collection backup controller, model and tests implemented.
Form backup controller, model and tests implemented.
Tests written and successful (203 tests, 8 mins to run) for all controllers, i.e., applicationsettings, collectionbackups, elicitationmethods, files, formbackups, forms, formsearches, languages, login, oldcollections, orthographies, pages, phonologies, sources, speakers, syntacticcategories, tags and users.