replaced 'email_from' config var with 'service_email' globally (except within unused functions)

new function to delete email contact address; updated mysql_backup.sh to new server config

patched all M::Email::send_message() returns to handle Return::Value object instead of string/undef

fixed L::Mail::_sendmail() to add text/html header where necessary; added admin_messages functions; requests_and_reports.pl sets contact according to flag

new function to exempt certain patient names from PDS/SMS lookup; removed recently discontinued email methods

bugfixes to diagnosis alert methods

MAJOR CHANGE: combined send_message and send_attachment into a single method dispatch() in L::Local::Mail - consistently returns a Return::Value object so no longer handling returns from simple mail and attachments differerntly - affects app and crons; fix for resources meter chart for swap mem on Deb6 VM; patched M::Outreach::update_followup() to prevent unnecessary db lookups for non-duration followup (eg other), and prevented crash when attempting to update non-existant table entry; moved loading of local-lib above FindBin in hilis4.fcgi to avoid fastcgi error in Deb6 VM

patched M::Roles::HistoryAction to clear actions list before sending diagnosis status alerts via cron, otherwise action list is cumulative for each successive array of addresses

refactored L::Model::Email to support SMTP authentication

new screen_category table; moved screens 'type' col to category_id; modified all screening terms & screening tests admin functions to accomodate new screen_category table; removed ajax validation from screen description & lab test field_label as these use 2 & 3-col unique keys so can't be validated by AJAX; email reports function uses users secure email address as sender; modifed portal_access function to supply SHA1 hash of current date - so failed login not sent back to portal page without explanation; modified mail_reports.pl to use item names instead of table id accessors

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