#112 modifications on the standard calendar is not propagated to resources that use standard calendar

[RR PP]

Steps to reproduce:
- create a new project
- create a resource that uses standard calendar
- modify the standard calendar so a weekend is working time
- create a task assigned to the resource above that starts on the saturday of the working weekend configured above

Result:
-the start date of the task is automatically set to the next monday

Expected result:
-since the resource uses the standard calendar and the standard calendar defines the weekend as working time, the task should start on saturday

Attached is a project that shows this problem.

As a workaround it's possible to double click on the task, go to "Advanced" sheet and check "Ignore Resource Calendar".