Bump MODULE_VERSION to 5.3.1

Change-Id: Ib01b7b81f4b154910595a5eacd5fa502241097fa
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Fix copy and paste error

Fix error 8 and 9 identified by static analysis from
http://www.viva64.com/en/b/0251/

Change-Id: I7f6741513814d8707e9dfe3402f970696238b8a3
Reviewed-by: Mitch Curtis <mitch.curtis@digia.com>
Fix copy and paste error

Fix error 11 identified by static analysis from
http://www.viva64.com/en/b/0251/

Change-Id: I3ed821c6d7cda874bfa5e3a24ccde1a4f2f13ec9
Reviewed-by: Jędrzej Nowacki <jedrzej.nowacki@digia.com>
Reviewed-by: Mitch Curtis <mitch.curtis@digia.com>
Merge remote-tracking branch 'origin/stable' into dev

Conflicts:
	.qmake.conf

Change-Id: Ia4376114da086f0e01c5e0833a222d5fb06e33fd