Sieve filter log and debug MTA options

A few MTA options relate to logging of Sieve filter applied actions, and debugging of MTA Sieve filter processing.

For debugging of Sieve filters, see also the  MTA option, the   utility, and the Sieve   action.

See also:
 * filter_debug MTA Option
 * log_filter MTA Option
 * log_transactionlog MTA Option
 * mm_debug MTA Option
 * test -expression utility
 * Sieve supported extensions
 * Sieve filter MTA options