moved jquery.js loading into html_wrapper and commented out all other refs to load it

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

refactored date constraints templates for charts & audit/stats functions into new date_constraints.tt + form2queryparam.js files; new audit functions