Removed "users.yml" fixture file from .gitignore and added it to the
repository.  It's OK if the test user is public.  Changed the user
used for testing from carlcrott to test_admin_user.
Added test for redmine bug #1879.
Accomodate the case where the selected citation has no associated
sites.  Fixes redmine bug #1879.
Bug fix for 'clicking use citation button for citation with no
associated sites should list sites under the "Listing Sites" section
of the Sites page' test.
Added test for first part of redmine bug #1880.
Fix for first part of redmine bug #1880: Issue a message to choose a
citation if user attempts to add a new management without having
selected a citation to work with.
Added test for part of redmine task #1880: checks that the new
managements page does not have form control for selecting the
citation.
Removed citations select form control, fixing part of redmin bug #1880.
Added a test to check for a message telling the user to add a
treatment for the selected citation before attempting to add a
management (cf. redmine issue #1880).
Added fixture to go with test for the "You must associate a treatment
with this citation before adding a new management" message.  Modified
managements controller to issue this message when appropriate, and
removed some debug code from a previous change.  This fixes redmine
issue #1880.