QtIFW

Fix incorrect error message in binarycreator.

This happened when calling binarycreator with -i and -n at the same time.
Also fix a similar error when calling with -f -n.
Also improve the error message when using -n together with -i or -e.

Task-number: QTIFW-189
Change-Id: I369b218172997d2b46b3209ab13dfc4101767a5c
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>
Reviewed-by: Kai Koehne <kai.koehne@digia.com>
Reviewed-by: Karsten Heimrich <karsten.heimrich@digia.com>
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>