-- turns neutral results into accepts.
-- always returns Filter_accept.
-- (From ELOG_FILTER)
-- if 'filters_anded' is set all filters must
-- return Filter_accept to be accepted.
-- (From ELOG_FILTER_CONSTANTS)
-- Remaining filters will be consulted to determine
-- if the event should be logged. If there are no
-- remaining filters then the event will be logged.
-- Note: neutral filters are ignored!
-- (From ELOG_FILTER_CONSTANTS)
-- if 'filters_anded' is not set all filters must
-- return Filter_reject rejected.
-- (From ELOG_FILTER_CONSTANTS)
turns the result of a filter to Filter_accept, if it was Filter_neutral