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EvenFinerGrainedPermissions

v4	v5
42	42	A few ideas:
43	43	- policy registration: each `IPermissionPolicy` can register "patterns" of actions, resources and users it is interested in; only fire the permissions that matches. Of course, there's a balance to find, and the pattern matching should not "cost" more than firing the rule. Also, determination of group membership should be cached when possible.
	44	- resource cache: some permission policies need to retrieve informations about the resources they're checking (e.g. [source:tags/trac-0.12/sample-plugins/permissions/vulnerability_tickets.py]). This could be avoided if the properties have already been retrieved before and we have a way to "reuse" them
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