added allow_inline_column_values() to DB::User to allow 'NOW()' to be passed inline - first attempt to fix peristent "could not parse datetime 'now' - invalid date format" error}
git-svn-id: https://jti.org.uk/svn/hmds_lims/trunk@1246 4177bd82-f056-0410-812d-caef170e3fa0