#97 Changes in resource calendar don't update successor tasks scheduling

[Laurent Savaete]

To reproduce:
- on a new project, create two tasks A & B, and set a non-zero duration for each
- add a FS dependency between them (a -> B)
- create a resource with default work calendar, and assign it to task A
- modify the resource calendar so to make one or more work days used for task A become non-working days

Result:
Scheduling for task A is updated, but not for task B, despite the FS dependency. To update scheduling, click the link and "ok".

Expected result:
Scheduling for task B should be updated automatically.