made addr_isequal() and addr_isequal_parent() more flexible refactored various bits of this stuff. addr_isequal_alias() had become needless now and was removed. In fail_msg.c: postmaster is now matched caseless, like required by RFC.

Since masqmail-0.2.22, documentation is maintained in troff (man page)
format directly. The old XML sources are no longer used.