changed user workload stats methods to store data in session to speed up chart generation, also changed (broken) RDBO method to dbix method - results should be correct now; quinitiles data bugfixes
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
refactored user_workload to allocate 1 unit per request, not 1 unit per specimen; added totals and percentages cdata to user_workload; moved user_workload query back to RDBO from dbix
