Update Account Manager Announcer for new subscription system

I need to get this working since I just started working with the AccountManagerPlugin on Trac 0.12.2. Related tickets are #7974 and #7977. Perhaps will find some time this weekend ...

Well, guess we all know, that it'll require still a bit more time. And certainly not due to being lazy or ignorant.

Busy times. Let's work and at least test together, as time permits.

(In [12312]) TracAnnouncer: Update AccountManagerPlugin messaging support, refs #7759, #7977, #8740, #8927, #9090 and #9204.

This long-standing regression is fixed now, while associated message templates are rather bare-bone ones yet and formatting could be improved significantly.

(In [12325]) TracAnnouncer: Fix generator, that was broken by [12309], refs #7759, #7976, #7977, #8740, #8927, #9090 and #9204.

And the same bad filter code even got replicated in [12312]. Sorry for not checking compiler errors earlier. Finally I discovered an UnboundLocalError for resource_id hidden behind the first error. Obviously unit tests are a blessing and needed here too.

(In [12331]) TracAnnouncer: Really fix filter now, refs #7759, #7976, #7977, #8740, #8927, #9090 and #9204.

Complete the change from [12325] to get expected behavior, or filters would be applied undesirably.

(In [12342]) TracAnnouncer: Add 'acct_mgr' as default for 'filter_exception_realms' option, refs #7759, #7976, #7977, #8740, #8927, #9090 and #9204.

IMHO this is required for better plugin usability, making AccountManagerPlugin notifications pass without additional configuration effort now.

Some Python doc-string tweaks and another unit test slipped in here too.

I'm seeing a syntax error from [12342]. I hope you don't mind if I push a quick fix now.

04:03:56 PM Trac[loader] ERROR: Skipping "announcer.filters = announcer.filters": 
Traceback (most recent call last):
  File "/home/user/Workspace/th10584/trac-trunk/trac/loader.py", line 68, in _load_eggs
    entry.load(require=True)
  File "/home/user/Workspace/th10584/lib/python2.6/site-packages/distribute-0.6.24-py2.6.egg/pkg_resources.py", line 1989, in load
    entry = __import__(self.module_name, globals(),globals(), ['__name__'])
  File "/home/user/Workspace/trac-hacks/announcerplugin/trunk/announcer/filters.py", line 51
     def filter_subscriptions(self, event, subscriptions):
       ^
SyntaxError: invalid syntax (filters.py, line 51)

Having made little errors like this myself makes me really appreciate the value of CI, which I enjoy at my day job and hope we can make available to trac-hacks someday.

(In [12353]) Refs #7759, #7976, #7977, #8740, #8927, #9090 and #9204: Fixed minor syntax error introduced in [12342].

[12353] was just a quick fix, but I'd suggest we also add a basic unit test. A very simple patch which adds a unit test that would fail prior to [12353] can be found in t7759-r12352-1.patch.

Patch against r12352 of the trunk

Obviously the change has been a bit too fast and focused at 'just' getting AcctMgr notifications fix done. Indeed, I was supposed to not let unit testing slip out of sight too much. Thanks a lot for reminding me.

(In [12357]) TracAnnouncer: Add a bare-bones filter unit test, refs #7759.

Thanks to Ryan J Ollos for nudging me about it.

33 unit tests pass now for Trac-0.12 and above, two of them fail for Trac-0.11 for known db API incompatibility issues, that will be addressed soon.

(In [12503]) AnnouncerPlugin: Extend AccountManager notifications as required, refs #843, #7759 and #7977.

Note, that any previous version of TracAnnouncer won't work with latest AccountManagerPlugin 'trunk' code, and this already made me thinking about a more robust change listener definition. But this is another subject.