Removing projects field from component view and filtering the activities...

... and milestones by project when creating task from component view + bugfix

* When creating task from a project, project field should not show and the activities, milestones should be filtered list for that project.
* bugfix in change_password
As I said, a "remover" is a method of the object to be manipulated, i.e. it belongs into the S3SQLCustomForm class and not anywhere else. No manipulations on the internals of an object should be implemented anywhere outside of the object class (=encapsulation principle of OOP).