Review: Display flow 0 (removed tasks)

[wxtim]

Description

Cylc review does not show removed tasks, and this is not a design decision.

This happens becuase cylc remove modifies the task_states table but not the task_jobs table, so that when the review_dao.py does a join on the two tables it excludes removed tasks.

Fixing this will either involve clever Sqlite or retrieving both tables and doing the join in Python (Slow and ugly).