integrated date_contraints.tt with user stats; chnaged outreach interim report to show diagnosis & comment when authorised, not just reported; ScriptHelpers::mail_admin() accepts 'subject' arg

completed outreach overdue pack notification function; moved logic to skip if notification already sent from template to model; separated outreach worklists from other worklists; switched off PDS lookup for test scripts; patched validation_profiles/admin.t consistent with change to username validation

added gender to simple sql search list; minor cron tweaks

MAJOR CHANGE: moved sql_lib() from M::Base to new M::Role::Query; moved all M::R::QueryFormatter methods into M::R::Query; removed sql_lib() from ScriptHelpers - using new M::Roles::Query method; removed lims_dbix() from M::Base - now loaded via M::Role::DBIxSimple on demand; moved get_sql_with_constraint() from M::R::DBIxSimple to M::R::Query; method gets dbh from lims_db not lims_dbix in M::LabSection::update_lab_sections() & M::Specimen::update_specimens(); added elements() to Local::QueryLibrary