Added support for currvalue column to store current interface counter values
Added a check to see if the previous counter value was lost and, if so, skip the database insert (since we can't calculate a rate with a single value)
Updated getopt args for new -E parameter. Updated test scripts for new max_errors_per_host param to get_clinserts()
Fixed a type in the SQL insert generated when use_currvalue_column is set
Added a check for zero-traffic interfaces
Fixed incorrect type on currvalue member of clinsert_value struct
Set release version to 2.2.4.