Upraded SpiffWorkflow and now use th new get_subprocess_specs
updated the calculate_stats in the workflow processor - as the serialization had changed drastically, and needed to debug some performance issues.
Added a get_navigation method that will calcuate a basic navigation list MUCH faster than using the get_flat_nav_list in Spiffworkflows Navigation object.
Modified a hellton of tests because we don't have total_task and completed_task counts, or a complex nested navigation list anymore.
Also:
* Assured that arguments are consistent (we always seem to use workflow_spec_id, so I made sure we use that consistently.
* Don't require named parameters - so it's cool to call it like: reset_workflow('my_workflow_id')
* Task Actions (ie create, assign, etc...) are now an enumeration in the models, and not static variables on Workflow Service, so we can reference them consistently from anywhere.
* Removed some repetitive code
* Always try to validate as much as possible in the scripts to save folks time debugging.
*
Add the lane information to the Task model.
Drop the foreign key constraint on the user_uid in the task log, as we might create tasks for users before they ever log into the system.
Add a new endpoint to the API called task events. It should be possible to query this and get a list of all tasks that need a users attention.
The task events returned include detailed information about the workflow and study as sub-models
Rename all the actions in event log to things that are easier to pass over the api as arguments, make this backwards compatible, updating existing names in the database via the migration.
Throughly test the navigation and task details as control of the workflow is passed between two lanes.
