First set of changes for v1.3

[+] Instance factory info got a new icon path parameter which can be
used to specify the path of an icon to be associated with the type of
manufacturable object.
[*] Fixed AbstractTreeItem::getIcon() and AbstractTreeItem::hasIcon()
which checked the wrong property on the object.
[*] Stepped version to v1.3.
[*] Commented out QTILITIES_PROPERTY_BROWSER define. Without it
Qtilities will just build on a new system. With it, users first have to
get the property browser solution to work.
Commented out QTILITIES_PROPERTY_BROWSER define.

This should have been part of previous commit...
Commented out QTILITIES_PROPERTY_BROWSER define. Without it Qtilities
will just build on a new system. With it, users first have to get the
property browser solution to work.