added onchange event to comments field

should save changes to database, but attempt fails. Need to trace the error.
fixed comment column reference

was attempting to update the table at COMMENTS. Was using COMMENT instead. fixed
now, and working.
getSource to check ledger date change

get source added to change in calendar date for a ledger entry. Right now,
scaffolding announces the returned value.
This value should be checked, if source is download, continue with existing
handling of a date change. But if not, then just update the date value in the
entry in the same way we do a comment or the serial.