[mtheoryx]

Use Case 1: As a user, I want to see the sum of estimated time for tasks displayed in the parent project's estimated time field.

Use Case 2: As a user, when I enter estimated times for tasks in a project, or add new tasks with estimated times to a project, I want to see that time added to the estimated time field for the parent project.

Use Case 3: As a user, when I make a task in a project complete, I want to see that task's estimate time subtracted from the project's estimated time.

Use Case 4: As a user, if I add a task, but do not add an estimated time, the project's estimated time should not change.