AbstractMaildirDomain implements IAliasableDomain but doesn't advertise that fact.

[thijs]

(In [37216]) Branching to 'maildirdomain-iface-6218'

[thijs]

(In [37219]) add interface, news file. refs #6218

[thijs]

Forced a  build, up for review.

[tom.prince]

1. Please add a test (using verifyClass) that it does in fact implement that interface.
2. Implementing IDomain is redundant, since IAliasableDomain inherits from it.
3. Similarly, the IAliasableDomain annotation on MaildirDirdbmDomain is now superflous.

Please commit after addressing the above issues.

[thijs]

(In [37247]) address review comments. refs #6218

[thijs]

Replying to tom.prince:

1. Please add a test (using verifyClass) that it does in fact implement that interface. 1. Implementing IDomain is redundant, since IAliasableDomain inherits from it. 1. Similarly, the IAliasableDomain annotation on MaildirDirdbmDomain is now superflous. Please commit after addressing the above issues.

Thanks for the review. Forced a  new build and will merge when its green.

[thijs]

(In [37250]) Merge maildirdomain-iface-6218: AbstractMaildirDomain implements IAliasableDomain and is now marked as such.

Author: thijs Reviewer: tom.prince Fixes: #6218

Also updates other interface definitions in maildir with zope.interface's @implementer decorator.