Project settings now have the option to use the global settings (on by
default), or custom ones.

Task-number: QTCREATORBUG-5445

Change-Id: I6602b53a6e7823150773e8461ef9db39b7546e98
Reviewed-on: http://codereview.qt.nokia.com/2163


Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: hjk <qthjk@ovi.com>