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
new search field request date- refactored L::Local::Search::generate_query() date fields; need to fix validation on request date fields in main_form.tt