Sieve filters and delivery flags channel options

There are a number of channel options controlling Sieve filters and message envelope and delivery flags.

See also:
 * addrtypescan Option
 * addrtypescanbccdefault Option
 * channelfilter Option
 * deliveryflags Option
 * destinationfilter Option
 * fileinto Option
 * filter Option
 * flagtransfer Option
 * disabledestinationfilter Option
 * disablesourcefilter Option
 * noaddrtypescan Option
 * nodestinationfilter Option
 * nofileinto Option
 * nofilter Option
 * noflagtransfer Option
 * nosourcefilter Option
 * scriptlimit Option
 * sievelimit Option
 * sizelimit Option
 * sourcefilter Option
 * Sieve filters
 * Functional group list of channel options