reading weewx/manager.py and weewx/xtypes.py, i think i see why it is not
working. the log shows the following string exactly once:
DEBUG weewx.manager: Daily summary version is 4.0
which means exactly one DaySummaryManager instance is created (for wx_binding),
meaning none for the other
i have updated the NOAA reports to include fields from another weewx database
(using $data_binding in tags). these external fields all work fine for
min,mintime,max,maxtime,avg,count but not for meanmax,meanmin. weewx v4.10.2
the period tags are $day,$month,$year (all at least one day) so i
