Restored some of the code that was commented out in the last commit
(9fe5411231912954902d0fbc81402a0ff5225ff3) of this file: we need to
set the @treatments instance variable in order to display the
treatments linked to the current citation.  The management_integration
spec now once again passes.
Wrote a test for redmine bug #1935.
Revised the test for redmine bug #1935 to something that actually passes when the bug has been fixed.
Restricted search in edit2_pfts_species to just three columns of the
species table.  This fixes redmine bug #1935 which resulted from
trying to use the 'LIKE' operator on numerical columns in postgres
without explicit casting (not an issue in MySQL).