patched search constraints error - date_before/after -> all_before/after + validation definition; changed some instances of User::get_user_details to User::get_user_by_username in controllers; added 'query_args' to get_page() js function in date_constraints.tt to allow eg sort_by params to be passed to date constraint constructors}
git-svn-id: https://jti.org.uk/svn/hmds_lims/trunk@1137 4177bd82-f056-0410-812d-caef170e3fa0
