Apparently the PEM EY wind sensor EPICS IOC is malfunctioning causing the H1:PEM-EY_WIND_ROOF_WEATHER_MPH channel to be dead.  This channel is checked in one of the DIAG_MAIN PEM tests, so the dead channel was causing DIAG_MAIN to go into a connection error state, thereby not executing any of the diagnostic tests.

I temporarily bypassed the test with the faulty channel, replacing it with a notification that the sensor channel is dead.  This change should be reverted once the channel is restored.

While I was at it, I did a little maintenance on DIAG_MAIN:

• I split up the PEM_CHANGE test (which included the broken test above) into separate PEM_WIND and PEM_EARTHQUAKE tests, just because they're logically distinct.
• I removed the avg_no_print module and any references to it, and replaced them with cdsutils.avg.  avg_no_print was a copy of the cdsutils.avg module with print statements removed.  Those print statements were removed from cdsutils.avg a while back, so this module is redundant.
• Fixed some ezca.LIGOFilter calls that were requiring an unnecessary import of LIGOFilter from the ezca module.