added _parse_data_val() function to C::Roles::Chart to return ::NoValue for null vals, so setGapColor() works as intended; moved make_chart logic from report/default.tt and record/body.tt to separate site/make_chart.tt; some tweaks to cron scripts}
git-svn-id: https://jti.org.uk/svn/hmds_lims/trunk@1261 4177bd82-f056-0410-812d-caef170e3fa0
