Trac-workflownotificationplugin

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* Configuring notifications through Trac's web admin system now requires
TICKET_ADMIN only, not full TRAC_ADMIN. This permission check is also
FineGrainedPermissions-aware.
* Notification templates can now access a `change_history` variable to email
all commenters on a ticket, display a full history of ticket changes in
the email body, and other use cases.

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* Notifications can now be configured through Trac's web admin system.

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* Support for Trac 0.11.7

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* Allow configuration of conditional notifications.
* Provide `action` string in templates.

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* Provide `old_values` dict in templates.
* '*'-notifications are no longer triggered for created actions.

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Everything is new!