Converts timestamps to integers in #search_result_ranks_and_ids.

git-svn-id: http://svn.redmine.org/redmine/trunk@13811 e93f8b46-1217-0410-a6f0-8f06a7374b81
Updates comments for r13811.

git-svn-id: http://svn.redmine.org/redmine/trunk@13812 e93f8b46-1217-0410-a6f0-8f06a7374b81